UBUNTU: [Packaging] override KERNELRELEASE instead of KERNELVERSION

It is wrong to override KERNELVERSION, as doing so does not ensure
the expected KERNELRELEASE. KERNELRELEASE is the essential part and
must agree with debian/control because it results in the 'uname -r'
in the compiled kernel.

scripts/setlocalversion may append additional strings depending on
CONFIG options and localversion* files. For example, if there exists
'localversion' file in the top directory, scripts/setlocalversion
will append a string written in it. This must not happen.

Debian kernel [1] and the upstream kernel [2] correctly override
KERNELRELEASE.

Let's fix Ubuntu kernel now.

[1]: https://salsa.debian.org/kernel-team/linux/-/blob/debian/6.5.10-1/debian/rules.real#L141
[2]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/scripts/package/debian/rules?id=v6.7-rc3#n18

Signed-off-by: Masahiro Yamada <masahiro.yamada@canonical.com>
Acked-by: Agathe Porte <agathe.porte@canonical.com>
Acked-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
(fixed up subject line as per Emil's comment)
Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>

debian/rules.d/0-common-vars.mk

@@ -230,10 +230,9 @@ kmake = make ARCH=$(build_arch) \
 	HOSTCC=$(HOSTCC) \
 	CC=$(CROSS_COMPILE)$(gcc) \
 	BINDGEN=bindgen-0.65 \
-	KERNELVERSION=$(abi_release)-$(target_flavour) \
+	KERNELRELEASE=$(abi_release)-$(target_flavour) \
 	CONFIG_DEBUG_SECTION_MISMATCH=y \
 	KBUILD_BUILD_VERSION="$(uploadnum)" \
-	LOCALVERSION= localver-extra= \
 	CFLAGS_MODULE="-DPKG_ABI=$(abinum)" \
 	PYTHON=$(PYTHON)
 ifneq ($(LOCAL_ENV_CC),)