.gitmodules: Change URL from git to https protocol
.gitmodules: Change URL from git to https protocol

Signed-off-by: Yuta Wakasawa <b44d5f6d9378fbfd6dac2a0d75009b12c6631ecf@renesas.com>

renesas-rcar/gst-omx,renesas-rcar/gst-omx,renesas-rcar/gst-omx