Change IPS freq to 66MHz

Recommended frequency is 66MHz
Change divider from 4 to 3.

Signed-off-by: John Rigby <jrigby@freescale.com>

include/mpc512x.h

@@ -185,7 +185,7 @@
 
 /* SCFR1 System Clock Frequency Register 1
  */
-#define SCFR1_IPS_DIV			0x4
+#define SCFR1_IPS_DIV			0x3
 #define SCFR1_IPS_DIV_MASK		0x03800000
 #define SCFR1_IPS_DIV_SHIFT		23