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/arc/include/asm/io.h b/arch/arc/include/asm/io.h
index 6adc0ed..c818b8b 100644
--- a/arch/arc/include/asm/io.h
+++ b/arch/arc/include/asm/io.h
@@ -80,7 +80,7 @@
 
 /*
  * We add memory barriers for __raw_readX / __raw_writeX accessors same way as
- * it is done for readX and writeX accessors as lots of U-boot driver uses
+ * it is done for readX and writeX accessors as lots of U-Boot driver uses
  * __raw_readX / __raw_writeX instead of proper accessor with barrier.
  */
 #define __raw_writeb(v, c)	({ __iowmb(); __arch_putb(v, c); })