Don't expose the hwcomposer vsync thread function in a header

The function is called only from the vsync thread, which is created
from a single file in the common static lib, so it doesn't need to be
in a header.

Bug: 135628605
Test: build
Change-Id: I1fd7e212c91d9c863e72dbaf04c83654ce50b3cf
2 files changed
tree: 59f2c8a7bc58db8b6cf1b095bc8cf2d1f650deaf
  1. common/
  2. guest/
  3. host/
  4. tests/
  5. tools/
  6. Android.bp
  7. Android.mk
  8. OWNERS
  9. TEST_MAPPING