drm/i915: stop recording IER in error capture

With pre-ilk GEN2_IER capture moved to gtier[0], the remaining IER
aren't all that relevant. Stop capturing them.

Suggested-by: Ville Syrjälä <[e-mail]>
Reviewed-by: Ville Syrjälä <[e-mail]>
Link: https://lore.kernel.org/r/6f1[e-mail]
Signed-off-by: Jani Nikula <[e-mail]>

drivers/gpu/drm/i915/i915_gpu_error.c

···
 static void err_print_gt_display(struct drm_i915_error_state_buf *m,
 				 struct intel_gt_coredump *gt)
 {
-	err_printf(m, "IER: 0x%08x\n", gt->ier);
 	err_printf(m, "DERRMR: 0x%08x\n", gt->derrmr);
 }
 
···
 
 	if (DISPLAY_VER(i915) >= 6 && DISPLAY_VER(i915) < 20)
 		gt->derrmr = intel_uncore_read(uncore, DERRMR);
-
-	if (GRAPHICS_VER(i915) >= 8)
-		gt->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
-	else if (IS_VALLEYVIEW(i915))
-		gt->ier = intel_uncore_read(uncore, VLV_IER);
-	else if (HAS_PCH_SPLIT(i915))
-		gt->ier = intel_uncore_read(uncore, DEIER);
 }
 
 /* Capture all other registers that GuC doesn't capture. */

drivers/gpu/drm/i915/i915_gpu_error.h

···
 	/* Generic register state */
 	u32 eir;
 	u32 pgtbl_er;
-	u32 ier;
 	u32 gtier[6], ngtier;
 	u32 forcewake;
 	u32 error; /* gen6+ */