Remove unused file lists

RS_FILES and AIDL_FILES were used for cleaning up the intermediate
src dir, but are no longer used after
If7529979de6fa62a651933a3a974f47b033851d6 and
I01feff7cc399ac5b88b83333a1ac86928d0a81e6.

Bug: 73885582
Test: m checkbuild
Change-Id: If2653f846b568fd2587c8e055ef820e17760f133
Merged-In: If2653f846b568fd2587c8e055ef820e17760f133
(cherry picked from commit c3e7074d)