Allow instrumenting android_test modules.

android_test modules should have Instrument = true like android_app
modules so that they get instrumented when EMMA_INSTRUMENT=true.

Bug: 115929955
Test: m EMMA_INSTRUMENT=true
Change-Id: I2c0e8ab95d2cdc47fc28af9c7264ab544d0e7a28

java/app.go

@@ -250,6 +250,8 @@ func AndroidTestFactory() android.Module {
 	module := &AndroidTest{}
 
 	module.Module.deviceProperties.Optimize.Enabled = proptools.BoolPtr(true)
+
+	module.Module.properties.Instrument = true
 	module.Module.properties.Installable = proptools.BoolPtr(true)
 
 	module.AddProperties(