Use hidl memory from allocator in CAS

Make mediaextractor use hidl memory allocated by
hidl allocator, instead of constructing hidl memory
from IMemory.

bug: 112766913
bug: 111407253
Change-Id: I7902f18768005c995925bc9a7947299e9988b68a
(Needed for internal commit I39e131718ea41f9cb23177c28213ddf7b7741338)

public/mediaextractor.te

@@ -16,6 +16,7 @@ allow mediaextractor hidl_token_hwservice:hwservice_manager find;
 allow mediaextractor system_server:fd use;
 
 hal_client_domain(mediaextractor, hal_cas)
+hal_client_domain(mediaextractor, hal_allocator)
 
 r_dir_file(mediaextractor, cgroup)
 allow mediaextractor proc_meminfo:file r_file_perms;

vendor/hal_cas_default.te

@@ -6,3 +6,5 @@ init_daemon_domain(hal_cas_default)
 
 # Allow CAS HAL's default implementation to use vendor-binder service
 vndbinder_use(hal_cas_default);
+
+allow hal_cas_default hal_allocator:fd use;