mpc83xx: add h/w flash protection to board configs

the operating system may leave flash in a h/w locked state after writing.
This allows u-boot to continue to write flash by enabling h/w unlocking
by default.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/include/configs/MPC837XERDB.h b/include/configs/MPC837XERDB.h
index 2ac4ad0..da77121 100644
--- a/include/configs/MPC837XERDB.h
+++ b/include/configs/MPC837XERDB.h
@@ -253,6 +253,7 @@
 #define CFG_FLASH_BASE		0xFE000000 /* FLASH base address */
 #define CFG_FLASH_SIZE		8 /* max FLASH size is 32M */
 
+#define CFG_FLASH_PROTECTION	1		/* Use h/w Flash protection. */
 #define CFG_FLASH_EMPTY_INFO			/* display empty sectors */
 #define CFG_FLASH_USE_BUFFER_WRITE		/* buffer up multiple bytes */