ANDROID: GKI: include more type definitions in vendor hooks

In an effort to improve ABI coverage, type definitions are now pulled
into vendor hook by #including public and internal kernel headers
where possible.

Exceptional cases (due to build breakage):

* `struct cgroup_taskset` remains forward declared
* `struct uclamp_se` is available in public header but only
  conditionally, so it is forward declared as well

Note the changes are all conditional on ! __GENKSYMS__ so that
MODVERSIONS symbol CRCs remain the same.

Bug: 233047575
Change-Id: I8d11b9afb0136fe006772f07affa993e9a8d23d3
Signed-off-by: Giuliano Procida <gprocida@google.com>