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/arch/blackfin/lib/Makefile b/arch/blackfin/lib/Makefile
index b534a98..de02c69 100644
--- a/arch/blackfin/lib/Makefile
+++ b/arch/blackfin/lib/Makefile
@@ -1,5 +1,5 @@
 #
-# U-boot Makefile
+# U-Boot Makefile
 #
 # Copyright (c) 2005-2008 Analog Devices Inc.
 #
diff --git a/arch/blackfin/lib/boot.c b/arch/blackfin/lib/boot.c
index 5644d58..fd4c82e 100644
--- a/arch/blackfin/lib/boot.c
+++ b/arch/blackfin/lib/boot.c
@@ -1,5 +1,5 @@
 /*
- * U-boot - boot.c - misc boot helper functions
+ * U-Boot - boot.c - misc boot helper functions
  *
  * Copyright (c) 2005-2008 Analog Devices Inc.
  *
diff --git a/arch/blackfin/lib/cache.c b/arch/blackfin/lib/cache.c
index e8a0cb5..8d93339 100644
--- a/arch/blackfin/lib/cache.c
+++ b/arch/blackfin/lib/cache.c
@@ -1,5 +1,5 @@
 /*
- * U-boot - cache.c
+ * U-Boot - cache.c
  *
  * Copyright (c) 2005-2008 Analog Devices Inc.
  *
diff --git a/arch/blackfin/lib/cmd_cache_dump.c b/arch/blackfin/lib/cmd_cache_dump.c
index f9f9097..a4c799a 100644
--- a/arch/blackfin/lib/cmd_cache_dump.c
+++ b/arch/blackfin/lib/cmd_cache_dump.c
@@ -1,5 +1,5 @@
 /*
- * U-boot - cmd_cache_dump.c
+ * U-Boot - cmd_cache_dump.c
  *
  * Copyright (c) 2007-2008 Analog Devices Inc.
  *
diff --git a/arch/blackfin/lib/kgdb.c b/arch/blackfin/lib/kgdb.c
index 4ca3fc7..2a7c072 100644
--- a/arch/blackfin/lib/kgdb.c
+++ b/arch/blackfin/lib/kgdb.c
@@ -1,5 +1,5 @@
 /*
- * U-boot - architecture specific kgdb code
+ * U-Boot - architecture specific kgdb code
  *
  * Copyright 2009 Analog Devices Inc.
  *
diff --git a/arch/blackfin/lib/muldi3.c b/arch/blackfin/lib/muldi3.c
index 65f5523..9f6f60d 100644
--- a/arch/blackfin/lib/muldi3.c
+++ b/arch/blackfin/lib/muldi3.c
@@ -1,5 +1,5 @@
 /*
- * U-boot - muldi3.c contains routines for mult and div
+ * U-Boot - muldi3.c contains routines for mult and div
  *
  * Copyright (c) 2005-2007 Analog Devices Inc.
  *
diff --git a/arch/blackfin/lib/sections.c b/arch/blackfin/lib/sections.c
index b50f30a..86fc4df 100644
--- a/arch/blackfin/lib/sections.c
+++ b/arch/blackfin/lib/sections.c
@@ -1,5 +1,5 @@
 /*
- * U-boot - section.c
+ * U-Boot - section.c
  *
  * Copyright (c) 2014 Analog Devices Inc.
  *
diff --git a/arch/blackfin/lib/string.c b/arch/blackfin/lib/string.c
index 211df7b..c904a88 100644
--- a/arch/blackfin/lib/string.c
+++ b/arch/blackfin/lib/string.c
@@ -1,5 +1,5 @@
 /*
- * U-boot - string.c Contains library routines.
+ * U-Boot - string.c Contains library routines.
  *
  * Copyright (c) 2005-2008 Analog Devices Inc.
  *