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/arch/arm/cpu/armv7/Kconfig b/arch/arm/cpu/armv7/Kconfig
index e33e536..ccc2f20 100644
--- a/arch/arm/cpu/armv7/Kconfig
+++ b/arch/arm/cpu/armv7/Kconfig
@@ -110,7 +110,7 @@
 config ARMV7_SET_CORTEX_SMPEN
 	bool
 	help
-	  Enable the ARM Cortex ACTLR.SMP enable bit in U-boot.
+	  Enable the ARM Cortex ACTLR.SMP enable bit in U-Boot.
 
 config SPL_ARMV7_SET_CORTEX_SMPEN
 	bool