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nvh264enc: Fix broken Y444 format encoding with system memory Y444 support

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:nvenc-444-fix into master

separateColourPlaneFlag is mapped to separate_colour_plane_flag which means Y, U and V planes are separately processed as monochrome sampled pictures. So encoder shouldn't set that flag for normal 4:4:4 encoding.

Also for 4:4:4 encoding, NV_ENC_H264_PROFILE_HIGH_444_GUID profile must be explicitly set.

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