drm/i915: remove i915_report_error()

i915_report_error() presently acts as a wrapper for __i915_printk(). In
practice, it would be better to use drm level error reporting wherever
possible, so replace all uses of i915_report_error() with the equivalent
drm_err() call. These cases are not worth having a dedicated wrapper to
also print bug reporting info. Replacing the calls leaves
i915_report_error() with no users, so remove it.

Reviewed-by: Tvrtko Ursulin <[e-mail]>
Reviewed-by: Andi Shyti <[e-mail]>
Reviewed-by: Jonathan Cavitt <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/19e[e-mail]
Signed-off-by: Jani Nikula <[e-mail]>

drivers/gpu/drm/i915/i915_driver.c

···
 	if (HAS_PPGTT(dev_priv)) {
 		if (intel_vgpu_active(dev_priv) &&
 		    !intel_vgpu_has_full_ppgtt(dev_priv)) {
-			i915_report_error(dev_priv,
-					  "incompatible vGPU found, support for isolated ppGTT required\n");
+			drm_err(&dev_priv->drm,
+				"incompatible vGPU found, support for isolated ppGTT required\n");
 			return -ENXIO;
 		}
 	}
···
 		 */
 		if (intel_vgpu_active(dev_priv) &&
 		    !intel_vgpu_has_hwsp_emulation(dev_priv)) {
-			i915_report_error(dev_priv,
-					  "old vGPU host found, support for HWSP emulation required\n");
+			drm_err(&dev_priv->drm,
+				"old vGPU host found, support for HWSP emulation required\n");
 			return -ENXIO;
 		}
 	}

drivers/gpu/drm/i915/i915_utils.h

···
 __i915_printk(struct drm_i915_private *dev_priv, const char *level,
 	      const char *fmt, ...);
 
-#define i915_report_error(dev_priv, fmt, ...)				   \
-	__i915_printk(dev_priv, KERN_ERR, fmt, ##__VA_ARGS__)
-
 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
 
 int __i915_inject_probe_error(struct drm_i915_private *i915, int err,