board_f: call timer_init on MIPS

MIPS needs a call to timer_init to preserve its current behaviour
ensuring that the cop0 compare register is initialised appropriately.

Reported-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Signed-off-by: Paul Burton <paul.burton@imgtec.com>

common/board_f.c

@@ -819,7 +819,7 @@ static init_fnc_t init_sequence_f[] = {
 	/* TODO: can we rename this to timer_init()? */
 	init_timebase,
 #endif
-#ifdef CONFIG_ARM
+#if defined(CONFIG_ARM) || defined(CONFIG_MIPS)
 	timer_init,		/* initialize timer */
 #endif
 #ifdef CONFIG_SYS_ALLOC_DPRAM