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vaallocator: Allow non-linear modifiers for dummy mem_maps

Robert Mader requested to merge rmader/gstreamer:vaallocator-ignore-dummy-mem-maps into main

A client may map dmabufs without the intention to either read or write to the memory. One example is clients wanting to use the gst_video_frame_map() helper function.

Thus, in order to make buffers from GstVaDmabufAllocator conveniently usable, ignore the modifier check if the client specified neither GST_MAP_READ nor GST_MAP_WRITE.

Also skip the va_sync_surface() call in that case, as it's likely only needed for CPU reads/writes.

Alternative approach to !5950 (closed)

cc: @ndufresne @slomo @He_Junyan

Edited by Robert Mader

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