Bump skiboot to skiboot-5.6.0-123-g4df53124cb34

Alistair Popple (7):
      hw/npu2-hw-procedures.c: Add nvram option to override zcal calculations
      hw/npu2.c: Hardcode MSR_SF when setting up npu XTS contexts
      NPU2: Add flag to nvlink config space indicating DL reset state
      hw/npu2.c: Change MCD BAR allocation order
      hw/npu2.c: Fix device aperture calculation
      platforms/astbmc/slots.c: Allow comparison of bus numbers when matching slots
      platforms/astbmc/witherspoon.c: Add NPU2 slot mappings

Andrew Donnellan (1):
      xive: Fix initialisation of xive_cpu_state struct

Cyril Bur (1):
      libflash/libffs: Correctly update the actual size of the partition

Michael Neuling (2):
      phb4: Harden init with bad PHBs
      Update default TSCR for P9

Stewart Smith (1):
      boot-tests: add OpenBMC support

Vasant Hegde (1):
      FSP: Add check to detect FSP R/R inside fsp_sync_msg()

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
diff --git a/openpower/package/skiboot/Config.in b/openpower/package/skiboot/Config.in
index 4b67b36..8b78129 100644
--- a/openpower/package/skiboot/Config.in
+++ b/openpower/package/skiboot/Config.in
@@ -31,7 +31,7 @@
 
 config BR2_SKIBOOT_VERSION
 	string
-	default "skiboot-5.6.0-110-gf6c4a51a8244" if BR2_SKIBOOT_LATEST_VERSION
+	default "skiboot-5.6.0-123-g4df53124cb34" if BR2_SKIBOOT_LATEST_VERSION
 	default BR2_SKIBOOT_CUSTOM_VERSION_VALUE \
 		if BR2_SKIBOOT_CUSTOM_VERSION