Allow SurfaceFlinger to use Power HAL.

When we have wide color gamut content, SurfaceFlinger might want to send a
PowerHint through Power Hal to boost GPU to higher frequency, to make sure GPU
composition can finish in time.

BUG: 110112323
Test: adb shell cat /sys/class/kgsl/kgsl-3d0/devfreq/cur_freq
Change-Id: If60c13aedc4ff84eaefd3430794dc15a478c5a73

private/surfaceflinger.te

@@ -14,6 +14,7 @@ read_runtime_log_tags(surfaceflinger)
 hal_client_domain(surfaceflinger, hal_graphics_allocator)
 hal_client_domain(surfaceflinger, hal_graphics_composer)
 hal_client_domain(surfaceflinger, hal_configstore)
+hal_client_domain(surfaceflinger, hal_power)
 allow surfaceflinger hidl_token_hwservice:hwservice_manager find;
 
 # Perform Binder IPC.