Enable ppe42-{gcc,binutils} as external toolchain

Create the infrastructure necessary to bundle ppe42-gcc and
ppe42-binutils as part of the sdk build, allowing it to be
re-inserted as part of an external sdk.

Signed-off-by: Klaus Heinrich Kiwi <klaus@linux.vnet.ibm.com>
diff --git a/openpower/configs/zz_defconfig b/openpower/configs/zz_defconfig
index db28ca4..9e52abd 100644
--- a/openpower/configs/zz_defconfig
+++ b/openpower/configs/zz_defconfig
@@ -45,6 +45,7 @@
 BR2_TARGET_ROOTFS_CPIO_XZ=y
 BR2_OPENPOWER_PLATFORM=y
 BR2_OPENPOWER_POWER9=y
+# BR2_PACKAGE_PPE42_TOOLCHAIN is not set
 # BR2_PACKAGE_HOST_OPENPOWER_FFS is not set
 # BR2_PACKAGE_HOSTBOOT is not set
 # BR2_PACKAGE_HOSTBOOT_BINARIES is not set
@@ -56,7 +57,5 @@
 BR2_PACKAGE_PETITBOOT_MTD=y
 # BR2_PACKAGE_CAPP_UCODE is not set
 BR2_PACKAGE_LOADKEYS=y
-# BR2_PACKAGE_HOST_PPE42_BINUTILS is not set
-# BR2_PACKAGE_HOST_PPE42_GCC is not set
 # BR2_PACKAGE_IMA_CATALOG is not set
 # BR2_PACKAGE_HOST_SB_SIGNING_UTILS is not set