Use correct spelling of "U-Boot"

Correct spelling of "U-Boot" shall be used in all written text
(documentation, comments in source files etc.).

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/include/configs/sh7763rdp.h b/include/configs/sh7763rdp.h
index 7148f1d..0fd2caf 100644
--- a/include/configs/sh7763rdp.h
+++ b/include/configs/sh7763rdp.h
@@ -56,7 +56,7 @@
 #define CONFIG_SYS_MAX_FLASH_BANKS (1)
 #define CONFIG_SYS_MAX_FLASH_SECT  (520)
 
-/* U-boot setting */
+/* U-Boot setting */
 #define CONFIG_SYS_LOAD_ADDR		(CONFIG_SYS_SDRAM_BASE + 4 * 1024 * 1024)
 #define CONFIG_SYS_MONITOR_BASE	(CONFIG_SYS_FLASH_BASE)
 #define CONFIG_SYS_MONITOR_LEN		(128 * 1024)