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/include/delay.h

@@ -1,11 +1,7 @@
 #ifndef DELAY_H
 #define DELAY_H
 
-#if CONFIG_HAVE_INIT_TIMER
 void init_timer(void);
-#else
-#define init_timer() do{} while(0)
-#endif
 
 void udelay(unsigned usecs);
 void mdelay(unsigned msecs);