Remove unnecessary libcore includes

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

Test: build
Bug: 111055375
Merged-In: Ia660abcf992c4acd8709d217116f895b07d9c61c
Change-Id: Ia660abcf992c4acd8709d217116f895b07d9c61c
(cherry picked from commit fa956d5d722dd600ed429f02c55e796f9dc2c772)
3 files changed