video: logo: Drop full path of the input filename in generated file

Avoid this Yocto build warning to make build reproducible:

    WARNING: linux-foo-6.8-r0 do_package_qa: QA Issue:
    File /usr/src/debug/linux-foo/6.8-r0/drivers/video/logo/logo_linux_clut224.c
    in package linux-foo-src contains reference to TMPDIR

Helge modified the patch to drop the whole line.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Helge Deller <deller@gmx.de>