boot-directdisk: fix bzImage source location

Fixes yocto [BUGID #876]

boot-directdisk.class looks in the wrong location for the bzImage to
install.  Make it look in the right place.

(From OE-Core rev: 173d04ea828e7f790ede40929c8ffd7340b4c077)

Signed-off-by: Tom Zanussi <tom.zanussi@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/boot-directdisk.bbclass

@@ -49,7 +49,7 @@ build_boot_dd() {
 	IMAGE=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hdddirect
 
 	install -d ${HDDDIR}
-	install -m 0644 ${STAGING_DIR}/${MACHINE}${HOST_VENDOR}-${HOST_OS}/kernel/bzImage ${HDDDIR}/vmlinuz
+	install -m 0644 ${STAGING_DIR_HOST}/kernel/bzImage ${HDDDIR}/vmlinuz
 	install -m 444 ${STAGING_LIBDIR}/syslinux/ldlinux.sys ${HDDDIR}/ldlinux.sys
 
 	BLOCKS=`du -bks ${HDDDIR} | cut -f 1`