[AdvancedFeatures] Add Feature Flag MultiDisplay

Create google images only advancedFeatures.ini files for user and
userdebug builds.

BUG: 133243970

Test: Manual

Signed-off-by: Weilun Du <wdu@google.com>
Change-Id: I80bbb34c1f1e31ef73bca4ca96976a2c124faf46
Merged-In: I80bbb34c1f1e31ef73bca4ca96976a2c124faf46

data/etc/user/advancedFeatures.ini → data/etc/google/user/advancedFeatures.ini

@@ -9,3 +9,4 @@ IntelPerformanceMonitoringUnit = on
 Wifi = on
 HostComposition = on
 DynamicPartition = on
+MultiDisplay = on

data/etc/google/userdebug/advancedFeatures.ini

+GrallocSync = on
+LogcatPipe = on
+GLAsyncSwap = on
+GLESDynamicVersion = on
+GLDMA = on
+EncryptUserData = on
+IntelPerformanceMonitoringUnit = on
+Wifi = on
+HostComposition = on
+RefCountPipe = on
+VirtioInput = on
+DynamicPartition = on
+MultiDisplay = on