recipes: use allarch.bbclass instead just PACKAGE_ARCH = all

* otherwise such recipes are rebuilt or reused from sstate after every
  MACHINE change, because of different checksums see [YOCTO #1075]

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-support/fbset/fbset-modes.bb

@@ -3,7 +3,7 @@ LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
 
 PV = "0.1.0"
-PR = "r5"
+PR = "r6"
 
 SRC_URI = "file://fb.modes"
 
@@ -12,6 +12,6 @@ do_install() {
     install -m 0644 ${WORKDIR}/fb.modes ${D}${sysconfdir}
 }
 
-PACKAGE_ARCH = "all"
+inherit allarch
 CONFFILES_${PN} = "${sysconfdir}/fb.modes"