scripts/tags.sh: remove find_sources

After commit '4f628248 kbuild: reintroduce ALLSOURCE_ARCHS support for
tags/cscope', find_sources only invoke find_arch_sources.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
CC: Jike Song <albcamus@gmail.com>
Link: https://lore.kernel.org/r/20231229030654.17474-4-richard.weiyang@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>