dri_interface: add __DRI_IMAGE_TRANSFER_USER_STRIDE

Allow the caller to specify the row stride (in bytes) with which an image
should be mapped. Note that completely ignoring USER_STRIDE is a valid
implementation of mapImage.

This is horrible API design. Unfortunately, cros_gralloc does indeed have
a horrible API design -- in that arbitrary images should be allowed to be
mapped with the stride that a linear image of the same width would have.

There is no separate capability bit because it's unclear how stricter
requirements should be defined.

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