Bump libflash/pflash to v5.9-166-g70f14f4dd86e

Adriana Kobylak (2):
      pflash: Support for volatile flag
      pflash: Support for clean_on_ecc_error flag

Cyril Bur (1):
      external/pflash: Fix erasing within a single erase block

Oliver O'Halloran (1):
      libflash: Fix parity calculation on ARM

Stewart Smith (2):
      libflash/blocklevel: suppress debug printout
      ffspart/pflash: fix tests for new VOLATILE flag

Suraj Jitindar Singh (1):
      external/pflash: Fix non-zero return code for successful read when size%256 != 0

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
diff --git a/openpower/package/libflash/libflash.mk b/openpower/package/libflash/libflash.mk
index 98ce0ed..e5fadac 100644
--- a/openpower/package/libflash/libflash.mk
+++ b/openpower/package/libflash/libflash.mk
@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBFLASH_VERSION = v5.8-123-gc06ed583
+LIBFLASH_VERSION = v5.9-166-g70f14f4dd86e
 LIBFLASH_SITE = $(call github,open-power,skiboot,$(LIBFLASH_VERSION))
 
 LIBFLASH_INSTALL_STAGING = YES