drm: Share the code to compute color plane dimesions
framebuffer_check() has some hand rolled code to compute the color plane dimensions based on the subsampled information. Let's share the code between framebuffer_check() and drm_framebuffer_plane_{width,height}(). Cc: Ben Widawsky <ben@bwidawsk.net> Cc: Jason Ekstrand <jason@jlekstrand.net> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170321181218.10042-2-ville.syrjala@linux.intel.com Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
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