drm: Deal with rotation in drm_plane_helper_check_update()

drm_plane_helper_check_update() needs to account for the plane rotation
for correct clipping/scaling calculations. Do so.

There was an earlier attempt [1] to add this into
intel_check_primary_plane() but I requested that it'd be put into the
helper instead. An updated patch never materialized AFAICS, so I went
ahead and cooked one up myself.

v2: Deal with new drm_plane_helper_check_update() callers

[1] https://patchwork.freedesktop.org/patch/65177/
Cc: Nabendu Maiti <[email protected]>
Cc: Noralf Trønnes <[email protected]>
Cc: CK Hu <[email protected]>
Cc: Mark Yao <[email protected]>
Cc: Russell King <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Reviewed-by: Patrik Jakobsson <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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