drm/xe/display: Add missing HPD interrupt enabling during non-d3cold RPM resume

Atm the display HPD interrupts that got disabled during runtime
suspend, are re-enabled only if d3cold is enabled. Fix things by
also re-enabling the interrupts if d3cold is disabled.

Cc: Rodrigo Vivi <[e-mail]>
Reviewed-by: Jonathan Cavitt <[e-mail]>
Signed-off-by: Imre Deak <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
(cherry picked from commit bbc4a30de095f0349d3c278500345a1b620d495e)
Signed-off-by: Lucas De Marchi <[e-mail]>

drivers/gpu/drm/xe/display/xe_display.c

···
 		return;
 	}
 
+	intel_hpd_init(xe);
 	intel_hpd_poll_disable(xe);
 }