drm/print: Add drm_err_printer()

A simple convienence function that returns a drm_printer which prints
using pr_err()

Changes since v1:
* Make __drm_printfn_err() more consistent with DRM_ERROR() - danvet

Cc: Juston Li <[email protected]>
Cc: Imre Deak <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Harry Wentland <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Signed-off-by: Lyude Paul <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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