power: Add property check for EXPENSIVE_RENDERING

Detect the support status of EXPENSIVE_RENDERING mode based on the
vendor property, which can be configured per target.

Change-Id: I39ed53f5df506bb8b7a714138d35e5b29bcfa4a5
CRs-Fixed: 3364809

power-common.h

@@ -62,6 +62,7 @@ enum CPU_GOV_CHECK {
 
 void power_init(void);
 void power_hint(power_hint_t hint, void *data);
+bool is_expensive_rendering_supported();
 void set_expensive_rendering(bool enabled);
 void set_interactive(int on);