set S from UNPACKDIR in recipes that use only local files

There is no need to have two assignments; also setting S from
UNPACKDIR (and not vice versa) is more logical as unpack
task comes first, and tasks that come after unpack use S to access
unpack results.

https://git.openembedded.org/openembedded-core/commit/?id=f64b7e5fb3181734c8dde87b27e872a026261a74
https://git.openembedded.org/openembedded-core/commit/?id=46480a5e66747a673041fe4452a0ab14a1736d5e

Signed-off-by: Alper Ak <alperyasinak1@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

recipes-bsp/gpio-shutdown/gpio-shutdown.bb

@@ -6,6 +6,8 @@ SRC_URI = "file://bind_gpio_shutdown.tab \
     file://gpio-shutdown-keymap.sh \
 "
 
+S = "${UNPACKDIR}"
+
 inherit  update-rc.d
 
 INITSCRIPT_NAME = "gpio-shutdown-keymap.sh"

recipes-bsp/rpi-u-boot-scr/rpi-u-boot-scr.bb

@@ -21,8 +21,7 @@ do_compile() {
 
 inherit kernel-arch deploy nopackages
 
-S = "${WORKDIR}/sources"
+S = "${UNPACKDIR}"
-UNPACKDIR = "${S}"
 
 do_deploy() {
     install -d ${DEPLOYDIR}

recipes-core/udev/udev-rules-udisks-rpi_1.0.bb

@@ -3,6 +3,8 @@ LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
 SRC_URI = "file://80-udisks-rpi.rules"
 
+S = "${UNPACKDIR}"
+
 INHIBIT_DEFAULT_DEPS = "1"
 
 do_install () {