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/test/py/tests/test_efi_secboot/conftest.py b/test/py/tests/test_efi_secboot/conftest.py
index 30ff702..ff7ac7c 100644
--- a/test/py/tests/test_efi_secboot/conftest.py
+++ b/test/py/tests/test_efi_secboot/conftest.py
@@ -14,7 +14,7 @@
 
     Args:
         request: Pytest request object.
-        u_boot_config: U-boot configuration.
+        u_boot_config: U-Boot configuration.
 
     Return:
         A path to disk image to be used for testing
@@ -139,7 +139,7 @@
 
     Args:
         request: Pytest request object.
-        u_boot_config: U-boot configuration.
+        u_boot_config: U-Boot configuration.
 
     Return:
         A path to disk image to be used for testing