libion: Extract headers to a separate build target

Make the header library host_supported, as a vendor project on git_main
needs the headers to preprocess (on the host) some source files which
are also used on the device.

Bug: 325444956
Test: m
Change-Id: Ibb9ef07fe70bf78d1bab53c977fbe4eceb9b2f3d
1 file changed
tree: 8a0a347445b110718867cdb7cc8d33bd8a804c0f
  1. include/
  2. kernel-headers/
  3. original-kernel-headers/
  4. tests/
  5. Android.bp
  6. ion.c
  7. ion_test.c
  8. METADATA
  9. OWNERS
  10. PREUPLOAD.cfg