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/m547xevb/README b/board/freescale/m547xevb/README
index ce497c0..30c5ded 100644
--- a/board/freescale/m547xevb/README
+++ b/board/freescale/m547xevb/README
@@ -54,7 +54,7 @@
 - include/asm-m68k/timer.h		Timer structure and definition
 - include/asm-m68k/types.h		Data types definition
 - include/asm-m68k/uart.h		Uart structure and definition
-- include/asm-m68k/u-boot.h		u-boot structure
+- include/asm-m68k/u-boot.h		U-Boot structure
 
 - include/configs/M5475EVB.h		Board specific configuration file
 
@@ -88,7 +88,7 @@
 CONFIG_SYS_FEC0_MIIBASE	-- Set FEC0 MII base register
 CONFIG_SYS_FEC1_MIIBASE	-- Set FEC0 MII base register
 MCFFEC_TOUT_LOOP	-- set FEC timeout loop
-CONFIG_HAS_ETH1		-- define to enable second FEC in u-boot
+CONFIG_HAS_ETH1		-- define to enable second FEC in U-Boot
 
 CONFIG_CMD_USB		-- enable USB commands
 CONFIG_USB_OHCI_NEW	-- enable USB OHCI driver