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/t4qds/eth.c b/board/freescale/t4qds/eth.c
index 83a3a9b..95f8c04 100644
--- a/board/freescale/t4qds/eth.c
+++ b/board/freescale/t4qds/eth.c
@@ -658,7 +658,7 @@
 		switch (fm_info_get_enet_if(i)) {
 		case PHY_INTERFACE_MODE_XGMII:
 			if ((srds_prtcl_s2 == 55) || (srds_prtcl_s2 == 57)) {
-				/* A fake PHY address to make U-boot happy */
+				/* A fake PHY address to make U-Boot happy */
 				fm_info_set_phy_address(i, i);
 			} else {
 				lane = serdes_get_first_lane(FSL_SRDS_1,
@@ -839,7 +839,7 @@
 		switch (fm_info_get_enet_if(i)) {
 		case PHY_INTERFACE_MODE_XGMII:
 			if ((srds_prtcl_s2 == 55) || (srds_prtcl_s2 == 57)) {
-				/* A fake PHY address to make U-boot happy */
+				/* A fake PHY address to make U-Boot happy */
 				fm_info_set_phy_address(i, i);
 			} else {
 				lane = serdes_get_first_lane(FSL_SRDS_2,