[OE-core][dunfell 07/11] linux-firwmare: restore WHENCE_CHKSUM variable

[Steve Sakoman <steve@sakoman.com>]

From: Dmitry Baryshkov <dbaryshkov@gmail.com>

Restore WHENCE_CHKSUM variable which is used to hold the WHENCE file
checksum. It is necessary to allow easily overriding it from local.conf
if the devupstream version is selected:

PREFERRED_VERSION_linux-firmware = "1:20220708+git%"
SRCREV:class-devupstream = "${AUTOREV}"
WHENCE_CHKSUM:class-devupstream:pn-linux-firmware = "abf1077491eeb261ecdcb680a34fc059"

Without the WHENCE_CHECKSUM one would need to manually patch the
LIC_FILES_CHKSUM variable to change the checksum of WHENC (e.g. using
the anonymous python function or remove expression).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 554be2af1e0a03a2d23032d48afbbe0913a45409)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
---
 .../recipes-kernel/linux-firmware/linux-firmware_20220708.bb | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/meta/recipes-kernel/linux-firmware/linux-firmware_20220708.bb b/meta/recipes-kernel/linux-firmware/linux-firmware_20220708.bb
index e7a7e0828f..27146154be 100644
--- a/meta/recipes-kernel/linux-firmware/linux-firmware_20220708.bb
+++ b/meta/recipes-kernel/linux-firmware/linux-firmware_20220708.bb
@@ -128,8 +128,11 @@ LIC_FILES_CHKSUM = "file://LICENCE.Abilis;md5=b5ee3f410780e56711ad48eadc22b8bc \
                     file://LICENCE.xc4000;md5=0ff51d2dc49fce04814c9155081092f0 \
                     file://LICENCE.xc5000;md5=1e170c13175323c32c7f4d0998d53f66 \
                     file://LICENCE.xc5000c;md5=12b02efa3049db65d524aeb418dd87ca \
-                    file://WHENCE;md5=def08711eb23ba967fb7e1f8cff66178 \
+                    file://WHENCE;md5=${WHENCE_CHKSUM} \
                     "
+# WHENCE checksum is defined separately to ease overriding it if
+# class-devupstream is selected.
+WHENCE_CHKSUM  = "def08711eb23ba967fb7e1f8cff66178"
 
 # These are not common licenses, set NO_GENERIC_LICENSE for them
 # so that the license files will be copied from fetched source
-- 
2.25.1