drm/xe/display: Use a single early init call for display

Now that interrupts are disabled for xe_display_init_noaccel,
both xe_display_init_noirq and xe_display_init_noaccel run in the same
context.

This means that we can get rid of the 3 different init calls. Without
interrupts, nothing is touching display up to this point.
Unify those 3 early display calls into a single xe_display_init_early(),
this makes the init sequence cleaner, and display less tangled during
init.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250121142850.4960-3-dev@lankhorst.se


Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>