ANDROID: remove inclusions from hook definition headers

To avoid changing the visibiliy of data types when including
hook definition headers remove header file inclusions from
the hook definition header files.

Instead, the hook definition headers should just have forward
declarations that don't require full definition.

To provide full definitions of the types for the KMI, the
headers that define the types should be included by the
source file that instantiates the hooks - normally
vendor_hooks.c.

Bug: 233047575
Signed-off-by: Todd Kjos <tkjos@google.com>
Change-Id: Iaaa1a6f45a356569c04ad2fea0b1514e0454f041