Since EDK2 BaseTools only require the brotli submodule,
we don't need to initialize other submodules to build it.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Message-Id: <20211018105816.2663195-2-philmd@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>