bg4cd: drop init_timer() stub

It's already in delay.h.

Change-Id: I41087604439aa0bcb8310cf6465f1a3d563d0b58
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/9456
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/marvell/bg4cd/monotonic_timer.c

@@ -23,7 +23,3 @@
 void timer_monotonic_get(struct mono_time *mt)
 {
 }
-
-void init_timer(void)
-{
-}