Enable p8-pore-binutils as an external toolchain

Create the infrastructure necessary to bundle the p8-pore-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/package/p8-pore-binutils/p8-pore-binutils.mk b/openpower/package/p8-pore-binutils/p8-pore-binutils.mk
index 7cd9807..00477a6 100644
--- a/openpower/package/p8-pore-binutils/p8-pore-binutils.mk
+++ b/openpower/package/p8-pore-binutils/p8-pore-binutils.mk
@@ -11,8 +11,8 @@
 P8_PORE_BINUTILS_PROVIDES = p8-pore-toolchain
 HOST_P8_PORE_BINUTILS_DEPENDENCIES = host-binutils
 
-P8_PORE_BINUTILS_DIR = $(STAGING_DIR)/p8-pore-binutils
-P8_PORE_BINUTILS_BIN = $(STAGING_DIR)/p8-pore-binutils/linux
+P8_PORE_BINUTILS_DIR = $(HOST_DIR)/$(P8_PORE_TOOLCHAIN_DIR)
+P8_PORE_BINUTILS_BIN = $(HOST_DIR)/$(P8_PORE_TOOLCHAIN_BIN)
 
 define HOST_P8_PORE_BINUTILS_BUILD_CMDS
         cd $(@D) && \