global: Use proper project name U-Boot

Use proper project name in comments, Kconfig, readmes.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/0dbdf0432405c1c38ffca55703b6737a48219e79.1684307818.git.michal.simek@amd.com
diff --git a/board/isee/igep003x/board.c b/board/isee/igep003x/board.c
index 5462a3d..7dbb080 100644
--- a/board/isee/igep003x/board.c
+++ b/board/isee/igep003x/board.c
@@ -37,7 +37,7 @@
 
 /* GPIO0_27 and GPIO0_26 are used to read board revision from IGEP003x boards
  * and control IGEP0034 green and red LEDs.
- * U-boot configures these pins as input pullup to detect board revision:
+ * U-Boot configures these pins as input pullup to detect board revision:
  * IGEP0034-LITE = 0b00
  * IGEP0034 (FULL) = 0b01
  * IGEP0033 = 0b1X