drm/i915: Properly clear crtc state when disabling it fully, again

drm/i915: Properly clear crtc state when disabling it fully, again

Currently we just leave the old gunk lying around in the crtc
state when userspace asks us to fully disable the crtc. That
doesn't match what the state would be had we never even enabled
the crtc in the first place. So let's make this consistent and
call intel_crtc_prepare_cleared_state() for disabled crtcs as well
(excluding bigjoiner slaves of course which have had their state
copied from the master).

I actually already did this once in commit db376515a5dc ("drm/i915:
Clear most of crtc state when disabling the crtc") but then
commit 270103923be6 ("drm/i915: Try to make bigjoiner work in atomic
check") undid it all :(

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220217103221.10405-5-ville.syrjala@linux.intel.com
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>