Allow sensor hal to use wakelock

Added permission related to use of wake lock. Wakelock in sensor
HAL is used to gurantee delivery of wake up sensor events before
system go back to sleep.

Bug: 63995095
Test: QCOM and nanohub sensor hal are able to acquire wakelock
      successfuly.

Change-Id: Id4ac3552e18a1cad252017e3dc9ab3d4be8d4ab9
Merged-In: Id4ac3552e18a1cad252017e3dc9ab3d4be8d4ab9

vendor/hal_sensors_default.te

@@ -6,5 +6,11 @@ init_daemon_domain(hal_sensors_default)
 
 allow hal_sensors_default fwk_scheduler_hwservice:hwservice_manager find;
 
+# Allow sensor hals to access and use gralloc memory allocated by
+# android.hardware.graphics.allocator
 allow hal_sensors_default hal_graphics_allocator_default:fd use;
 allow hal_sensors_default ion_device:chr_file r_file_perms;
+
+# allow sensor hal to use lock for keeping system awake for wake up
+# events delivery.
+wakelock_use(hal_sensors_default);