initscripts-swupdate-usb: inherit allarch class

Inheriting allarch class instead of using PACKAGE_ARCH = "all" allows
sstate to correctly track the package.

Signed-off-by: Jacopo Dall'Aglio <jacopo.dallaglio@kynetics.com>
Acked-by: Stefano Babic <sbabic@denx.de>

recipes-core/initscripts-swupdate/initscripts-swupdate-usb.bb

@@ -20,6 +20,6 @@ do_install () {
 PACKAGES = "${PN}"
 FILES_${PN} = "/"
 
-PACKAGE_ARCH = "all"
+inherit allarch
 
 CONFFILES_${PN} = ""