ANDROID: kbuild: use modules.order in adjust_autoksyms.sh

This is essentially a partial backport of b7dca6dd1e59 ("kbuild: create
*.mod with full directory path and remove MODVERDIR") as a full backport
would pull in too many dependencies.

It is necessary to simplify the backport of the TRIM_NONLISTED_KMI
feature.

Bug: 148277666
Change-Id: Ibf85bf864b3961d5bec4965742f08a80e9f234af
Signed-off-by: Quentin Perret <qperret@google.com>