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/ts4800.h b/include/configs/ts4800.h
index 2f6c97c..50e1abb 100644
--- a/include/configs/ts4800.h
+++ b/include/configs/ts4800.h
@@ -20,7 +20,7 @@
 #define CONFIG_DISPLAY_BOARDINFO
 
 #define CONFIG_SYS_NO_FLASH		/* No NOR Flash */
-#define CONFIG_SKIP_LOWLEVEL_INIT	/* U-boot is a 2nd stage bootloader */
+#define CONFIG_SKIP_LOWLEVEL_INIT	/* U-Boot is a 2nd stage bootloader */
 
 #define CONFIG_HW_WATCHDOG