ANDROID: Add headers to vendor_hooks.c for type visibility

Include headers in vendor_hooks.c to improve type visibilty.
With this change, 46 types that were unknown in the previous
XML were fully defined and 16 types that were previously opaque
became fully defined.

Of the 96 remaining opaque types, 43 are defined in C files, so
they are truly opaque and inaccessible to vendor modules. This
leaves 53 opaque types that need some investigation.

Bug: 233047575
Signed-off-by: Todd Kjos <tkjos@google.com>
Change-Id: I2ede44177d7028cee93e69cc866b4c80e7229116