drm/xlnx: Use devm_drm_dev_alloc

Gets rid of drmm_add_final_kfree, which I want to unexport so that it
stops confusion people about this transitional state of rolling drm
managed memory out.

This also fixes the missing drm_dev_put in the error path of the probe
code.

v2: Drop the misplaced drm_dev_put from zynqmp_dpsub_drm_init (all
other paths leaked on error, this should have been in
zynqmp_dpsub_probe), now that subsumed by the auto-cleanup of
devm_drm_dev_alloc.

Reviewed-by: Hyun Kwon <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Hyun Kwon <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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