drm/i915: Clean up pre-skl primary plane registers
Use REG_BIT() & co. for the pre-skl primary plane registers.
Also give everything a consistent namespace.
v2: s/DSP/DISP/ to avoid confusion (José)
Use DISP_WIDTH rather than DISP_POS_X for DSPSIZE (José)
Deal with gvt
Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220121113036.23240-2-ville.syrjala@linux.intel.com
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>