Sepolicy for allocator hal.

Bug: 32123421
Test: full build/test of allocator hal using hidl_test
Change-Id: I253b4599b6fe6e7f4a2f5f55b34cdeed9e5d769b

private/file_contexts

@@ -244,6 +244,7 @@
 /system/bin/hw/android\.hardware\.vibrator@1\.0-service       u:object_r:hal_vibrator_default_exec:s0
 /system/bin/hw/android\.hardware\.vr@1\.0-service             u:object_r:hal_vr_default_exec:s0
 /system/bin/hw/android\.hardware\.wifi@1\.0-service           u:object_r:hal_wifi_default_exec:s0
+/system/bin/hw/android\.hidl\.memory@1\.0-service             u:object_r:hal_allocator_exec:s0
 
 #############################
 # Vendor files

private/hal_allocator.te

+init_daemon_domain(hal_allocator)

public/hal_allocator.te

+# allocator subsystem
+type hal_allocator, domain;
+type hal_allocator_exec, exec_type, file_type;
+
+# hwbinder access
+hwbinder_use(hal_allocator)

public/te_macros

@@ -222,6 +222,14 @@ define(`binder_service', `
 typeattribute $1 binderservicedomain;
 ')
 
+#####################################
+# hwallocator_use(domain)
+# Allow a domain to use Hidl shared memory
+define(`hwallocator_use', `
+# Call into the allocator hal
+binder_call($1, hal_allocator);
+'')
+
 #####################################
 # wakelock_use(domain)
 # Allow domain to manage wake locks