drm/i915: Remove references to previously removed UMS config option

Commit 03dae59c ("drm/i915: Ditch UMS config option") removed
CONFIG_DRM_I915_UMS from the Kconfig file, but i915_drv.c still
references this option in two #ifndef statements.

As an undefined config option will always be 'false', we can drop
the #ifndefs alltogether and adapt the printed error message.

This inconsistency was found with the undertaker tool.
Signed-off-by: Andreas Ruprecht <rupran@einserver.de>
[danvet: Undo logging change as requested by Jani.]
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.c

@@ -1651,11 +1651,9 @@ static int __init i915_init(void)
 
 	if (!(driver.driver_features & DRIVER_MODESET)) {
 		driver.get_vblank_timestamp = NULL;
-#ifndef CONFIG_DRM_I915_UMS
 		/* Silently fail loading to not upset userspace. */
 		DRM_DEBUG_DRIVER("KMS and UMS disabled.\n");
 		return 0;
-#endif
 	}
 
 	/*
@@ -1671,10 +1669,8 @@ static int __init i915_init(void)
 
 static void __exit i915_exit(void)
 {
-#ifndef CONFIG_DRM_I915_UMS
 	if (!(driver.driver_features & DRIVER_MODESET))
 		return; /* Never loaded a driver. */
-#endif
 
 	drm_pci_exit(&driver, &i915_pci_driver);
 }