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/armv8/Kconfig b/arch/arm/cpu/armv8/Kconfig
index 7d5cf15..9f0fb36 100644
--- a/arch/arm/cpu/armv8/Kconfig
+++ b/arch/arm/cpu/armv8/Kconfig
@@ -145,7 +145,7 @@
 	bool "Enable PSCI support" if EXPERT
 	help
 	  PSCI is Power State Coordination Interface defined by ARM.
-	  The PSCI in U-boot provides a general framework and each platform
+	  The PSCI in U-Boot provides a general framework and each platform
 	  can implement their own specific PSCI functions.
 	  Say Y here to enable PSCI support on ARMv8 platform.