mpc8xxx: LCRR[CLKDIV] is sometimes five bits

On newer CPUs, 8536, 8572, and 8610, the CLKDIV field of LCRR is five bits
instead of four.

In order to avoid an ifdef, LCRR_CLKDIV is set to 0x1f on all systems.  It
should be safe as the fifth bit was defined as reserved and set to 0.

Code that was using a hard coded 0x0f is changed to use LCRR_CLKDIV.

Signed-off-by: Trent Piepho <tpiepho@freescale.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Jon Loeliger <jdl@freescale.com>
diff --git a/board/tqc/tqm85xx/tqm85xx.c b/board/tqc/tqm85xx/tqm85xx.c
index 73f1d01..cda8208 100644
--- a/board/tqc/tqm85xx/tqm85xx.c
+++ b/board/tqc/tqm85xx/tqm85xx.c
@@ -361,7 +361,7 @@
 {
 	volatile ccsr_lbc_t *lbc = (void *)(CONFIG_SYS_MPC85xx_LBC_ADDR);
 	sys_info_t sys_info;
-	ulong clkdiv = lbc->lcrr & 0x0f;
+	ulong clkdiv = lbc->lcrr & LCRR_CLKDIV;
 
 	get_sys_info (&sys_info);