libv4l-rockchip_v2: Fix BITRATE_MODE querymenu This is a fix of crrev.com/c/3707295, in which I checked the wrong index value of querymenu. It causes QUERYMENU for bitrate mode fails. BUG=b:182240945, b:238718566 TEST=Chrome lists up supported encode profiles correctly Change-Id: I8b6ed5e597e13371400c244bfe7fb348cb8676b1 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/libv4lplugins/+/3775904 Commit-Queue: Hirokazu Honda <[email protected]> Reviewed-by: Chen-Yu Tsai <[email protected]> Tested-by: Hirokazu Honda <[email protected]> Commit-Queue: Chen-Yu Tsai <[email protected]> Auto-Submit: Hirokazu Honda <[email protected]>