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
2 files changed