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/drivers/net/fsl-mc/mc.c b/drivers/net/fsl-mc/mc.c
index fdbd584..53c4966 100644
--- a/drivers/net/fsl-mc/mc.c
+++ b/drivers/net/fsl-mc/mc.c
@@ -455,7 +455,7 @@
 
 	/*
 	 * Management Complex cores should be held at reset out of POR.
-	 * U-boot should be the first software to touch MC. To be safe,
+	 * U-Boot should be the first software to touch MC. To be safe,
 	 * we reset all cores again by setting GCR1 to 0. It doesn't do
 	 * anything if they are held at reset. After we setup the firmware
 	 * we kick off MC by deasserting the reset bit for core 0, and