signing-keys: Use SYSROOT_DIRS to add dirs to stage in sysroot

(From OE-Core rev: 4a37960e504d6c0bbd0f4c088bef8f3a99beab6a)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/meta/signing-keys.bb

@@ -12,6 +12,8 @@ inherit allarch deploy
 EXCLUDE_FROM_WORLD = "1"
 INHIBIT_DEFAULT_DEPS = "1"
 
+SYSROOT_DIRS += "${sysconfdir}/pki"
+
 PACKAGES =+ "${PN}-ipk ${PN}-rpm ${PN}-packagefeed"
 
 FILES_${PN}-rpm = "${sysconfdir}/pki/rpm-gpg"
@@ -54,10 +56,6 @@ do_install () {
     fi
 }
 
-sysroot_stage_all_append () {
-    sysroot_stage_dir ${D}${sysconfdir}/pki ${SYSROOT_DESTDIR}${sysconfdir}/pki
-}
-
 do_deploy () {
     if [ -f "${B}/rpm-key" ]; then
         install -D -m 0644 "${B}/rpm-key" "${DEPLOYDIR}/RPM-GPG-KEY-${DISTRO_VERSION}"