kernel-arch: add macro-prefix-map in KERNEL_CC

When building external modules, macros can include absolute names of
kernel headers. The macro-prefix-map for the STAGING_KERNEL_DIR is
currently missing. Add it in the same way as its done in bitbake.conf.

This fixes reproducible builds and following build error:
ERROR: cryptodev-module-1.14-r0 do_package_qa: QA Issue: File <..>
cryptodev.ko <..> contains reference to TMPDIR [buildpaths]

(From OE-Core rev: a741e11751bfb8f52be58cf51abeddca4559e5e9)

(From OE-Core rev: 58eb15cdc2dd95bf5eb0bed2a0f1c43bf29cf273)

Signed-off-by: Stefan Müller-Klieser <s.mueller-klieser@phytec.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/classes-recipe/kernel-arch.bbclass

@@ -71,7 +71,13 @@ HOST_AR_KERNEL_ARCH ?= "${TARGET_AR_KERNEL_ARCH}"
 TARGET_OBJCOPY_KERNEL_ARCH ?= ""
 HOST_OBJCOPY_KERNEL_ARCH ?= "${TARGET_OBJCOPY_KERNEL_ARCH}"
 
-KERNEL_CC = "${CCACHE}${HOST_PREFIX}gcc ${HOST_CC_KERNEL_ARCH} -fuse-ld=bfd ${DEBUG_PREFIX_MAP} -fdebug-prefix-map=${STAGING_KERNEL_DIR}=${KERNEL_SRC_PATH} -fdebug-prefix-map=${STAGING_KERNEL_BUILDDIR}=${KERNEL_SRC_PATH}"
+KERNEL_CC = "${CCACHE}${HOST_PREFIX}gcc ${HOST_CC_KERNEL_ARCH} \
+ -fuse-ld=bfd ${DEBUG_PREFIX_MAP} \
+ -fdebug-prefix-map=${STAGING_KERNEL_DIR}=${KERNEL_SRC_PATH} \
+ -fmacro-prefix-map=${STAGING_KERNEL_DIR}=${KERNEL_SRC_PATH} \
+ -fdebug-prefix-map=${STAGING_KERNEL_BUILDDIR}=${KERNEL_SRC_PATH} \
+ -fmacro-prefix-map=${STAGING_KERNEL_BUILDDIR}=${KERNEL_SRC_PATH} \
+"
 KERNEL_LD = "${HOST_PREFIX}ld.bfd ${HOST_LD_KERNEL_ARCH}"
 KERNEL_AR = "${HOST_PREFIX}ar ${HOST_AR_KERNEL_ARCH}"
 KERNEL_OBJCOPY = "${HOST_PREFIX}objcopy ${HOST_OBJCOPY_KERNEL_ARCH}"