davinci: omapl138_lcdk: increase u-boot load size

A size of 0x200 seems way too short for u-boot. Increase the size
to 512k.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/omapl138_lcdk.h

@@ -176,7 +176,7 @@
 #define CONFIG_SYS_NAND_5_ADDR_CYCLE
 #define CONFIG_SYS_NAND_PAGE_SIZE	(2 << 10)
 #define CONFIG_SYS_NAND_BLOCK_SIZE	(128 << 10)
-#define CONFIG_SYS_NAND_U_BOOT_SIZE	0x200 /*0x60000*/
+#define CONFIG_SYS_NAND_U_BOOT_SIZE	SZ_512K
 #define CONFIG_SYS_NAND_U_BOOT_DST	0xc1080000
 #define CONFIG_SYS_NAND_U_BOOT_START	CONFIG_SYS_NAND_U_BOOT_DST
 #define CONFIG_SYS_NAND_U_BOOT_RELOC_SP	(CONFIG_SYS_NAND_U_BOOT_DST - \