Add witherspoon defconfig, p9 support for hostboot

Opened RTC issues 160270 and 160273 to fix patches that were
added.
diff --git a/openpower/package/hostboot-binaries/Config.in b/openpower/package/hostboot-binaries/Config.in
index eccf3e3..4c3e770 100644
--- a/openpower/package/hostboot-binaries/Config.in
+++ b/openpower/package/hostboot-binaries/Config.in
@@ -1,5 +1,5 @@
 config BR2_PACKAGE_HOSTBOOT_BINARIES
         bool "hostboot_binaries"
-        default y if (BR2_OPENPOWER_PLATFORM && BR2_powerpc_power8)
+        default y if (BR2_OPENPOWER_PLATFORM)
         help
             Project to stage hostboot binary images