Split P8 and P9 Hostboot and OCC packages

This was causing a couple of issues:
1) increased complexity in build files
2) It breaks the pkg-version patch detection/checksum
3) Failing to apply patches to would silently fail

The split makes this a bit easier and requires less custom code.

We keep the P9 hostboot/occ named hostboot/occ, so that day-to-day,
nobody notices a difference. The only difference you'll notice
is if doing POWER8 hostboot/occ development, as the package name
will be 'hostboot-p8' or 'occ-p8'.

Fixes: https://github.com/open-power/op-build/issues/876
Fixes: https://github.com/open-power/op-build/issues/1194
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
diff --git a/openpower/package/common-p8-xml/Config.in b/openpower/package/common-p8-xml/Config.in
index 2c01702..560c1d6 100644
--- a/openpower/package/common-p8-xml/Config.in
+++ b/openpower/package/common-p8-xml/Config.in
@@ -1,4 +1,4 @@
 config BR2_PACKAGE_COMMON_P8_XML
         bool "Common P8 XML files"
-        default y if BR2_PACKAGE_HOSTBOOT
+        default y if BR2_PACKAGE_HOSTBOOT_P8
         select BR2_PACKAGE_OPENPOWER_MRW