Remove unnecessary libcore includes

This commit removes includes that don't appear to be needed.

Test: build
Bug: 111055375
Merged-In: I72465d0af56e408c5e99c1fd304bf2e7ff6d9f83
Change-Id: I72465d0af56e408c5e99c1fd304bf2e7ff6d9f83
(cherry picked from commit c1a30c4d8a5ed581ccc9d42791044c43565e6d71)
1 file changed