drm/i915: Reduce I915_MAX_GT to 2

According to Ashutosh there is no current or planned product in i915 for
I915_MAX_GT to be 4 anymore.

Cc: Matt Roper <[email protected]>
Cc: Ashutosh Dixit <[email protected]>
Cc: Andi Shyti <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Umesh Nerlige Ramappa <[email protected]>

Signed-off-by: Matt Atwood <[email protected]>
Reviewed-by: Matt Roper <[email protected]>
Reviewed-by: Ashutosh Dixit <[email protected]>
Signed-off-by: Matt Roper <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: msatwood

drivers/gpu/drm/i915/i915_drv.h

@@ -313,7 +313,7 @@ struct drm_i915_private {
 	/*
 	 * i915->gt[0] == &i915->gt0
 	 */
-#define I915_MAX_GT 4
+#define I915_MAX_GT 2
 	struct intel_gt *gt[I915_MAX_GT];
 
 	struct kobject *sysfs_gt;