Add libeffects_headers.

Also had to fix the location and symlink of them.

Test: works with BOARD_VNDK_VERSION := current
Bug: 33241851
Merged-In: Idcfe1eaaf7be10a183b69bafa07f035ab9ca1e4e
Change-Id: Idcfe1eaaf7be10a183b69bafa07f035ab9ca1e4e
(cherry picked from commit a3b4ef8b5f99e3161684bb56b1e77f94903e194a)
3 files changed