skiboot: Bump POWER9 platforms to current git master, f0ebbc8318e64870a68d337e77b0257678c2b055

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
diff --git a/openpower/configs/zz_defconfig b/openpower/configs/zz_defconfig
index 0b13e1a..73f7cb1 100644
--- a/openpower/configs/zz_defconfig
+++ b/openpower/configs/zz_defconfig
@@ -51,7 +51,7 @@
 # BR2_PACKAGE_OCC is not set
 # BR2_PACKAGE_CAPP_UCODE is not set
 BR2_SKIBOOT_CUSTOM_VERSION=y
-BR2_SKIBOOT_CUSTOM_VERSION_VALUE="skiboot-5.5.0"
+BR2_SKIBOOT_CUSTOM_VERSION_VALUE="f0ebbc8318e64870a68d337e77b0257678c2b055"
 BR2_PACKAGE_LOADKEYS=y
 # BR2_PACKAGE_HOST_PPE42_BINUTILS is not set
 # BR2_PACKAGE_HOST_PPE42_GCC is not set