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/freescale/mpc8569mds/README b/board/freescale/mpc8569mds/README
index 3d12a96..86c3ccd 100644
--- a/board/freescale/mpc8569mds/README
+++ b/board/freescale/mpc8569mds/README
@@ -3,7 +3,7 @@
 MPC8569MDS is composed of two boards - PB (Processor Board) and PIB (Platform
 I/O Board). The mpc8569 PowerTM processor is mounted on PB board.
 
-Building U-boot
+Building U-Boot
 -----------
 	make MPC8569MDS_config
 	make
@@ -22,10 +22,10 @@
 0xfe00_0000   0xffff_ffff     Flash                   32MB
 
 
-Flashing u-boot Images
+Flashing U-Boot Images
 ---------------
 
-Use the following commands to program u-boot image into flash:
+Use the following commands to program U-Boot image into flash:
 
 	=> tftp 1000000 u-boot.bin
 	=> protect off all