Bump skiboot to 5.5.0-rc2

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
diff --git a/openpower/configs/romulus_defconfig b/openpower/configs/romulus_defconfig
index 6ab7048..395959a 100644
--- a/openpower/configs/romulus_defconfig
+++ b/openpower/configs/romulus_defconfig
@@ -59,7 +59,7 @@
 BR2_OCC_BIN_FILENAME="occ.bin"
 BR2_CAPP_UCODE_BIN_FILENAME="cappucode.bin"
 BR2_SKIBOOT_CUSTOM_VERSION=y
-BR2_SKIBOOT_CUSTOM_VERSION_VALUE="bd87856aef965603ee6eb02ce80d7d1d56739ebb"
+BR2_SKIBOOT_CUSTOM_VERSION_VALUE="skiboot-5.5.0-rc2"
 BR2_PACKAGE_LOADKEYS=y
 BR2_ROMULUS_SYSTEM_XML_FILENAME="ROMULUS_hb.system.xml"
 BR2_ROMULUS_MRW_XML_FILENAME="ROMULUS_hb.mrw.xml"