roms/edk2: Only init brotli submodule to build BaseTools

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>

roms/Makefile

@@ -143,7 +143,8 @@ build-efi-roms: build-pxe-roms
 #    efirom
 #
 edk2-basetools:
-	cd edk2/BaseTools && git submodule update --init --force
+	cd edk2/BaseTools && git submodule update --init --force \
+		Source/C/BrotliCompress/brotli
 	$(MAKE) -C edk2/BaseTools \
 		PYTHON_COMMAND=$${EDK2_PYTHON_COMMAND:-python3} \
 		EXTRA_OPTFLAGS='$(EDK2_BASETOOLS_OPTFLAGS)' \