libflash: use skiboot v6.3-rc3

Changes for libflash,external/gard and external/pflash:

Andrew Jeffery (53):
      pflash: Don't try update RO ToC
      libflash/test: Generate header dependencies for tests
      ffspart, libflash: Fix stack size warnings
      pflash: Increase stack frame size warning threshold
      gard: Fix warnings from gcc 8.2.0
      Makefile: Paper over gard and pflash coverage issues
      test-ipmi-hiomap: Add ability to delay some IPMI messages
      test-ipmi-hiomap: Dump unexpected IPMI messages
      test-ipmi-hiomap: Ensure the completion code is set
      test-ipmi-hiomap: Print some information on early scenario_exit()
      libflash/ipmi-hiomap: Fix leak of msg in callback
      libflash/ipmi-hiomap: Overhaul error handling
      libflash/ipmi-hiomap: Overhaul event handling
      libflash/ipmi-hiomap: Remove unused close handling
      libflash/ipmi-hiomap: Enforce message size for empty response
      test-ipmi-hiomap: Add protocol-persistent-error test
      test-ipmi-hiomap: Add read-one-block test
      test-ipmi-hiomap: Add read-two-blocks test
      test-ipmi-hiomap: Add event-before-read
      test-ipmi-hiomap: Add event-during-read test
      test-ipmi-hiomap: Add write-one-block test
      test-ipmi-hiomap: Add write-two-blocks test
      test-ipmi-hiomap: Add event-before-write test
      test-ipmi-hiomap: Add event-during-write test
      test-ipmi-hiomap: Add erase-one-block test
      test-ipmi-hiomap: Add erase-two-blocks test
      test-ipmi-hiomap: Add event-before-erase test
      test-ipmi-hiomap: Add event-during-erase
      test-ipmi-hiomap: Add bad-sequence test
      test-ipmi-hiomap: Add action-error test
      test-ipmi-hiomap: Add get-flash-info test
      test-ipmi-hiomap: Add get-info-error test
      test-ipmi-hiomap: Add get-flash-info-error test
      test-ipmi-hiomap: Add create-read-window-error test
      test-ipmi-hiomap: Add create-write-window-error test
      test-ipmi-hiomap: Add mark-dirty-error test
      test-ipmi-hiomap: Add flush-error test
      test-ipmi-hiomap: Add ack-error test
      test-ipmi-hiomap: Add erase-error test
      test-ipmi-hiomap: Add ack-malformed tests
      test-ipmi-hiomap: Add get-info-malformed tests
      test-ipmi-hiomap: Add get-flash-info-malformed tests
      test-ipmi-hiomap: Add create-read-window-malformed tests
      test-ipmi-hiomap: Add create-write-window-malformed tests
      test-ipmi-hiomap: Add mark-dirty-malformed tests
      test-ipmi-hiomap: Add flush-malformed tests
      test-ipmi-hiomap: Add erase-malformed tests
      test-ipmi-hiomap: Add protocol-recovery-failure-ack test
      test-ipmi-hiomap: Add protocol-recovery-failure-get-info test
      test-ipmi-hiomap: Add protocol-recovery-get-flash-info-failure test
      test-ipmi-hiomap: Add read-one-block-twice test
      test-ipmi-hiomap: Add write-one-block-twice test
      test-ipmi-hiomap: Add erase-one-block-twice test

Michal Suchanek (1):
      libffs: Fix string truncation gcc warning.

Stewart Smith (1):
      pflash: Support encoding/decoding ECC'd partitions

Vasant Hegde (6):
      libflash/ecc: Fix compilation warning
      libflash/ipmi-hiomap: Fix blocks count issue
      test-ipmi-hiomap: Assert if size is zero
      test-ipmi-hiomap: Add write-one-byte test
      test-ipmi-hiomap: Fix lpc-read-success
      test-ipmi-hiomap: Add read-one-byte test

Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
diff --git a/openpower/package/libflash/libflash.mk b/openpower/package/libflash/libflash.mk
index 8b9d336..c1a5ce0 100644
--- a/openpower/package/libflash/libflash.mk
+++ b/openpower/package/libflash/libflash.mk
@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBFLASH_VERSION = v6.2
+LIBFLASH_VERSION = v6.3-rc3
 LIBFLASH_SITE = $(call github,open-power,skiboot,$(LIBFLASH_VERSION))
 
 LIBFLASH_INSTALL_STAGING = YES