fixup! drm/xe/display: Implement display support

drm/xe: Fixup small bug in xe_de.h

In display it's not called from irq context, so use xe_mmio_wait32 with
atomic = false. This fixes a splat and the need for i915_utils.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Closes: #245

drivers/gpu/drm/xe/display/xe_de.h

@@ -70,8 +70,9 @@ __intel_de_wait_for_register(struct drm_i915_private *i915, i915_reg_t reg,
 			     unsigned int fast_timeout_us,
 			     unsigned int slow_timeout_ms, u32 *out_value)
 {
-	return wait_for_atomic(((*out_value = xe_mmio_read32(to_gt(i915), reg.reg)) & mask) == value,
-			slow_timeout_ms);
+	return xe_mmio_wait32(to_gt(i915), reg.reg, value, mask,
+			      fast_timeout_us + 1000 * slow_timeout_ms,
+			      out_value, false);
 }
 
 static inline int