emulator: support system as root

Add SystemAsRoot = on to advancedFeatures.ini.

BUG: 69770927

Test: build sdk_gphone_x86-userdebug,
boot to home with tot emulator

Test: build sdk_phone_armv7-userdebug,
boot to home with tot emulator

Change-Id: I72bb3c1b9bb09293284765f63047ce82fb039cc0
diff --git a/sys-img/advancedFeatures.ini.arm b/sys-img/advancedFeatures.ini.arm
index 9886f75..29c1cf7 100644
--- a/sys-img/advancedFeatures.ini.arm
+++ b/sys-img/advancedFeatures.ini.arm
@@ -3,3 +3,4 @@
 GLAsyncSwap = on
 GLESDynamicVersion = on
 GLDMA = on
+SystemAsRoot = on