UPSTREAM: kbuild: do not include include/config/auto.conf from adjust_autoksyms.sh

Commit cd195bc4 ("kbuild: split adjust_autoksyms.sh in two parts")
split out the code that needs include/config/auto.conf.

This script no longer needs to include include/config/auto.conf.

Bug: 254441685
Fixes: cd195bc4 ("kbuild: split adjust_autoksyms.sh in two parts")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
(cherry picked from commit 12e9dea6)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I1c2cb44a3266e935f1c23cf8c4edd90ca1a05a0f