This switches most remaining HALs to the _client/_server approach.
To unblock efforts blocked on majority of HALs having to use this
model, this change does not remove unnecessary rules from clients of
these HALs. That work will be performed in follow-up commits. This
commit only adds allow rules and thus does not break existing
functionality.

The HALs not yet on the _client/_server model after this commit are:
* Allocator HAL, because it's non-trivial to declare all apps except
  isolated apps as clients of this HAL, which they are.
* Boot HAL, because it's still on the non-attributized model and I'm
  waiting for update_engine folks to answer a couple of questions
  which will let me refactor the policy of this HAL.

Test: mmm system/sepolicy
Test: Device boots, no new denials
Test: Device boots in recovery mode, no new denials
Bug: 34170079
Change-Id: I03e6bcec2fa02f14bdf17d11f7367b62c68a14b9

hal_*_default daemons whose policy is in common/device-agnostic policy
are provided by the vendor image (see vendor/file_contexts). Thus,
their policy should also reside in the vendor image, rather than in
the system image. This means their policy should live in the vendor
subdirectory of this project.

Test: Device boots and appears to work
Bug: 34135607
Bug: 34170079
Change-Id: I6613e43733e03d4a3d4726f849732d903e024016

This marks all HAL domain implementations with the haldomain attribute
so that rules can be written which apply to all HAL implementations.

This follows the pattern used for appdomain, netdomain and
bluetoothdomain.

Test: No change to policy according to sesearch.
Bug: 34180936
Change-Id: I0cfe599b0d49feed36538503c226dfce41eb65f6

Bug: 34231014
Test: Boot angler to ensure no additional denials are reported.

Change-Id: Ic2372d55f7072c65e7ea17036a8eb40dc531d60e
Signed-off-by: Sandeep Patil <sspatil@google.com>

Bug: http://b/32905206



Test: Boot sailfish and no new selinux failures observed in logs

Change-Id: Id9a46180074a61f8cf8d176a7b2ebc995a13b9f9
Signed-off-by: Sandeep Patil <sspatil@google.com>

Test: tested with default health HAL on angler running as service.
Bug: b/32754732

Change-Id: Ie0b70d43cb23cd0878e1b7b99b9bebdbd70d17c7
Signed-off-by: Sandeep Patil <sspatil@google.com>
(cherry picked from commit ef62fd91)