.gitignore: Add .vscode/

Visual Studio Code uses the directory .vscode/ to store data, so add it
to the .gitignore.

Signed-off-by: Tim Van Patten <timvp@google.com>
Change-Id: I8fe6439f01bd5ada8ceb814a22602db241aa11d6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66701
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jon Murphy <jpmurphy@google.com>

.gitignore

@@ -33,6 +33,7 @@ tags
 .clang_complete
 .cache
 compile_commands.json
+.vscode/
 
 # Cross-compile toolkits
 xgcc/