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/board/bf609-ezkit/Makefile b/board/bf609-ezkit/Makefile
index 3bfd088..e4184ee 100644
--- a/board/bf609-ezkit/Makefile
+++ b/board/bf609-ezkit/Makefile
@@ -1,5 +1,5 @@
 #
-# U-boot - Makefile
+# U-Boot - Makefile
 #
 # Copyright (c) 2005-2008 Analog Device Inc.
 #
diff --git a/board/bf609-ezkit/bf609-ezkit.c b/board/bf609-ezkit/bf609-ezkit.c
index 86da028..c993ca6 100644
--- a/board/bf609-ezkit/bf609-ezkit.c
+++ b/board/bf609-ezkit/bf609-ezkit.c
@@ -1,5 +1,5 @@
 /*
- * U-boot - main board file
+ * U-Boot - main board file
  *
  * Copyright (c) 2008-2011 Analog Devices Inc.
  *
diff --git a/board/bf609-ezkit/soft_switch.c b/board/bf609-ezkit/soft_switch.c
index e0c8d93..7c117ea 100644
--- a/board/bf609-ezkit/soft_switch.c
+++ b/board/bf609-ezkit/soft_switch.c
@@ -1,5 +1,5 @@
 /*
- * U-boot - main board file
+ * U-Boot - main board file
  *
  * Copyright (c) 2008-2011 Analog Devices Inc.
  *
diff --git a/board/bf609-ezkit/soft_switch.h b/board/bf609-ezkit/soft_switch.h
index d147fe1..75d64e2 100644
--- a/board/bf609-ezkit/soft_switch.h
+++ b/board/bf609-ezkit/soft_switch.h
@@ -1,5 +1,5 @@
 /*
- * U-boot - main board file
+ * U-Boot - main board file
  *
  * Copyright (c) 2008-2011 Analog Devices Inc.
  *