board_f: powerpc: Use timer_init() instead of init_timebase()

There is no good reason to use a different name on PowerPC. Change it to
timer_init() like the others.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: York Sun <york.sun@nxp.com>
Reviewed-by: Stefan Roese <sr@denx.de>

arch/powerpc/cpu/mpc5xx/cpu_init.c

@@ -43,7 +43,7 @@ void cpu_init_f (volatile immap_t * immr)
 	immr->im_uimb.uimb_umcr = CONFIG_SYS_UMCR;
 
 	/* Time base and decrementer will be enables (TBE) */
-	/* in init_timebase() in time.c called from board_init_f(). */
+	/* in timer_init() in time.c called from board_init_f(). */
 
 	/* Initialize the PIT. Unlock PISCRK */
 	immr->im_sitk.sitk_piscrk = KAPWR_KEY;

arch/powerpc/lib/time.c

@@ -60,7 +60,7 @@ unsigned long ticks2usec(unsigned long ticks)
 #endif
 /* ------------------------------------------------------------------------- */
 
-int init_timebase (void)
+int timer_init(void)
 {
 	unsigned long temp;