Blackfin: bf537-stamp: bump default SCLK up to 125MHz

Since all of the bf537-stamp and bf537-ezkit boards out there can handle it,
increase the speed of SCLK to 125MHz rather than 100MHz.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

include/configs/bf537-stamp.h

@@ -36,7 +36,7 @@
 #define CONFIG_CCLK_DIV			1
 /* SCLK_DIV controls the system clock divider				*/
 /* Values can range from 1-15						*/
-#define CONFIG_SCLK_DIV			5
+#define CONFIG_SCLK_DIV			4
 
 
 /*