Optimize power usage in VA sharing scenarios.

- in VA sharing scenarios driver needs to be as power efficient as possible
- Added new mode to KMD notify helper called maxPowerSavingMode
- in this mode, whenever GPU is not busy, driver will choose non busy wait
path.

Change-Id: I7e4079be995107bea543ffda774ca161ce483944

runtime/sharings/sharing_factory.cpp

@@ -81,6 +81,10 @@ bool SharingFactory::finalizeProperties(Context &context, int32_t &errcodeRet) {
     return true;
 }
 
+bool SharingFactory::isSharingPresent(SharingType sharingId) {
+    return sharingContextBuilder[sharingId] != nullptr;
+}
+
 SharingBuilderFactory *SharingFactory::sharingContextBuilder[SharingType::MAX_SHARING_VALUE] = {
     nullptr,
 };