Create permission manager AIDL

Today, the package manager largely routes any permission related
method to the PermissionManagerService. But, PermissionManagerService
is a service in name only. Instead, we will make the
PermissionManagerService a real service and direct API calls directly
to it.

We will likely need to maintain all of the public permission APIs
that already exist on PackageManager. However, the public -> private
implementation will go directly to PermissionManagerService.

Bug: 135279435
Test: Manual. Device boots
Change-Id: Ia4992ba6d1f4b9050db98c7d7647d51a5d45fcbe