Add support for using the hcode repo

    -Add hcode package to enable compiling hardware
     reference image
    -Modify pnor and sbe makefiles to include a dependency on
     the hcode repository
    -Modify config files so that p9 platfoms use the compiled
     version of the hardware reference image by default
    -Update hostboot-binaries.mk to install the ring images
     to the staging dir

[stewart: remove IBM Austin specific paths, update defconfigs]
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
diff --git a/openpower/configs/romulus_defconfig b/openpower/configs/romulus_defconfig
index 301e824..5f78349 100644
--- a/openpower/configs/romulus_defconfig
+++ b/openpower/configs/romulus_defconfig
@@ -58,6 +58,7 @@
 BR2_PACKAGE_PETITBOOT=y
 BR2_PACKAGE_PETITBOOT_MTD=y
 BR2_OCC_BIN_FILENAME="occ.bin"
+# BR2_HCODE_INCLUDE_IONV is not set
 BR2_CAPP_UCODE_BIN_FILENAME="cappucode.bin"
 BR2_PACKAGE_LOADKEYS=y
 BR2_IMA_CATALOG_DTS="POWER9"