strip comments from event-log-tags on device

This saves about 8k from the system image.

Bug: 2036961
diff --git a/logcat/Android.mk b/logcat/Android.mk
index f9fd2c9..5a9f12d 100644
--- a/logcat/Android.mk
+++ b/logcat/Android.mk
@@ -21,5 +21,6 @@
 LOCAL_MODULE_CLASS := ETC
 
 LOCAL_SRC_FILES := $(LOCAL_MODULE)
+LOCAL_PREBUILT_STRIP_COMMENTS := 1
 
 include $(BUILD_PREBUILT)