Create virtual packages for OpenPower toolchain

Create a "toolchain" category, plus "p8-pore-toolchain" and
"ppe42-toolchain" virtual-packages, with the goal of lowering the
coupling between these toolchain and target packages.

Signed-off-by: Klaus Heinrich Kiwi <klaus@linux.vnet.ibm.com>
diff --git a/openpower/package/occ-p8/occ-p8.mk b/openpower/package/occ-p8/occ-p8.mk
index a925a53..7630497 100644
--- a/openpower/package/occ-p8/occ-p8.mk
+++ b/openpower/package/occ-p8/occ-p8.mk
@@ -16,7 +16,7 @@
 OCC_P8_STAGING_DIR = $(STAGING_DIR)/occ
 
 OCC_P8_IMAGE_BIN_PATH = src/image.bin
-OCC_P8_DEPENDENCIES = host-binutils host-p8-pore-binutils
+OCC_P8_DEPENDENCIES = host-binutils host-p8-pore-toolchain
 
 define OCC_P8_BUILD_CMDS
         cd $(@D)/src && \