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v4l2object: use bt601 transfer function for SMPTE170M

Michael Tretter requested to merge m.tretter/gst-plugins-good:fix-v4l2-colorspace-detection into master

Commit 1d0ccf8baaf4 ("video-color: Add bt601 transfer function") [0] adds a separate transfer function for bt.601 instead of reusing the id of the 709 transfer function. Therefore, the V4L2_COLORSPACE_SMPTE170M does not match the bt601 colorimetry string anymore.

Set the transfer function to GST_VIDEO_TRANSFER_BT601 if V4L2_COLORSPACE_SMPTE170M is found to identify it as bt601.

[0] gst-plugins-base@1d0ccf8b

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