Get rid of HAVE_INIT_TIMER config option

There is redundancy in terms of use of init_timer. We have a Kconfig option to
decide whether a board has init_timer as well as we use a stub for init_timer in
places where we do not have any init_timer defined. Thus, remove the Kconfig
option. Henceforth, all boards that do not have init_timer functionality can
include a stub_timer if required.

Change-Id: I35d38ec686f4dc92861cf9248f9b540323cd98ae
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: http://review.coreboot.org/5569
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/drivers/pc80/udelay_io.c

@@ -1,6 +1,10 @@
 #include <arch/io.h>
 #include <delay.h>
 
+void init_timer(void)
+{
+}
+
 void udelay(unsigned usecs)
 {
 	int i;