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
diff --git a/private/surfaceflinger.te b/private/surfaceflinger.te
index e64b8de..e2f1a07 100644
--- a/private/surfaceflinger.te
+++ b/private/surfaceflinger.te
@@ -14,6 +14,7 @@
 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.