Remove private headers from libcutils.vendor

Bug: 63135587
Test: m -j
Test: BOARD_VNDK_VERSION=current m -j
Test: mma -j
Test: BOARD_VNDK_VERSION=current mma -j

Change-Id: I9eecf23c4c311bd8336a5bfaaeb2afb3b51c6513
Merged-In: I9eecf23c4c311bd8336a5bfaaeb2afb3b51c6513
2 files changed