init: Move signal handling to signal_handler.c

Change-Id: I3a24afa28a1cd279c749d6f384f687b8de56067e
diff --git a/init/Android.mk b/init/Android.mk
index e107bbb..3233883 100644
--- a/init/Android.mk
+++ b/init/Android.mk
@@ -11,7 +11,8 @@
 	util.c \
 	parser.c \
 	logo.c \
-	keychords.c
+	keychords.c \
+	signal_handler.c
 
 ifeq ($(strip $(INIT_BOOTCHART)),true)
 LOCAL_SRC_FILES += bootchart.c