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/hcode/hcode.mk b/openpower/package/hcode/hcode.mk
index c97d54a..1e4e889 100644
--- a/openpower/package/hcode/hcode.mk
+++ b/openpower/package/hcode/hcode.mk
@@ -12,7 +12,7 @@
 HCODE_INSTALL_IMAGES = YES
 HCODE_INSTALL_TARGET = NO
 
-HCODE_DEPENDENCIES = host-binutils host-ppe42-gcc hostboot-binaries
+HCODE_DEPENDENCIES = host-binutils host-ppe42-toolchain hostboot-binaries
 
 HW_IMAGE_BIN_PATH=output/images/hw_image
 HW_IMAGE_BIN=p9n.hw_image.bin