ppc/85xx: Fix LCRR_CLKDIV defines

For some reason the CLKDIV field varies between SoC in how it interprets
the bit values.

All 83xx and early (e500v1) PQ3 devices support:
 clk/2: CLKDIV = 2
 clk/4: CLKDIV = 4
 clk/8: CLKDIV = 8

Newer PQ3 (e500v2) and MPC86xx support:
 clk/4: CLKDIV = 2
 clk/8: CLKDIV = 4
 clk/16: CLKDIV = 8

Ensure that the MPC86xx and MPC85xx still get the same behavior and make
the defines reflect their logical view (not the value of the field).

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/include/configs/XPEDITE5200.h b/include/configs/XPEDITE5200.h
index deda208..d79231b 100644
--- a/include/configs/XPEDITE5200.h
+++ b/include/configs/XPEDITE5200.h
@@ -103,7 +103,7 @@
  * 0xfc00_0000	0xffff_ffff	NOR Flash 1		64M non-cacheable
  */
 
-#define CONFIG_SYS_LBC_LCRR	(LCRR_CLKDIV_4 | LCRR_EADC_3)
+#define CONFIG_SYS_LBC_LCRR	(LCRR_CLKDIV_8 | LCRR_EADC_3)
 
 /*
  * NAND flash configuration