meta: 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.

Also adjust reference test data in selftest/recipeutils to reflect changes in test recipes.

(From OE-Core rev: f64b7e5fb3181734c8dde87b27e872a026261a74)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-kernel/dtc/python3-dtschema-wrapper_2021.10.bb

@@ -7,8 +7,7 @@ SRC_URI = "file://dt-doc-validate \
            file://dt-mk-schema \
            file://dt-validate"
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 do_install() {
     install -d ${D}${bindir}/

meta/recipes-kernel/kmod/depmodwrapper-cross_1.0.bb

@@ -1,8 +1,7 @@
 SUMMARY = "Wrapper script for the Linux kernel module dependency indexer"
 LICENSE = "MIT"
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 INHIBIT_DEFAULT_DEPS = "1"
 # The kernel and the staging dir for it is machine specific

meta/recipes-kernel/linux/linux-dummy.bb

@@ -31,8 +31,7 @@ COMPATIBLE_HOST = ".*-linux"
 
 SRC_URI = "file://COPYING.GPL"
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 do_configure() {
 	:

meta/recipes-kernel/make-mod-scripts/make-mod-scripts_1.0.bb

@@ -8,8 +8,7 @@ inherit pkgconfig
 
 PACKAGE_ARCH = "${MACHINE_ARCH}"
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 do_configure[depends] += "virtual/kernel:do_shared_workdir openssl-native:do_populate_sysroot"
 do_compile[depends] += "virtual/kernel:do_compile_kernelmodules"

meta/recipes-kernel/modutils-initscripts/modutils-initscripts.bb

@@ -4,8 +4,7 @@ LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://modutils.sh;beginline=3;endline=3;md5=b2dccaa94b3629a08bfb4f983cad6f89"
 SRC_URI = "file://modutils.sh"
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 INITSCRIPT_NAME = "modutils.sh"
 INITSCRIPT_PARAMS = "start 06 S ."