init: Fix compiler warnings

Missing function return type causing compiler to misinterpret
it as int. All compiler warnings are fixed

Change-Id: I2f33777b9a682c33945e994d527ec67c5d0d6e47
diff --git a/platform/init.c b/platform/init.c
index 0c5a850..be48ad6 100644
--- a/platform/init.c
+++ b/platform/init.c
@@ -88,7 +88,7 @@
 	return 0;
 }
 
-__WEAK ce_clock_init(void)
+__WEAK void ce_clock_init(void)
 {
 }