drm/i915: Switch to using DP_MSA_MISC_* defines

Now that we have standard defines for the MSA MISC bits lets use
them on HSW+ where we program these directly into the TRANS_MSA_MISC
register.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190718145053.25808-7-ville.syrjala@linux.intel.com


Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>