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/doc/README.pcap b/doc/README.pcap
index 8e30b93..10318ef 100644
--- a/doc/README.pcap
+++ b/doc/README.pcap
@@ -1,6 +1,6 @@
 PCAP:
 
-U-boot supports live Ethernet packet capture in PCAP(2.4) format.
+U-Boot supports live Ethernet packet capture in PCAP(2.4) format.
 This is enabled by CONFIG_CMD_PCAP.
 
 The capture is stored on physical memory, and should be copied to