[PATCH i-g-t 3/3] tests/kms_rotation_crc: Remove intel guards

[Louis Chauvet]

In this patch I forgot to remove this modifier if the device is not an 
intel GPU:

	modifier = data->override_modifier ?: I915_FORMAT_MOD_Y_TILED;

line 389 in tests/kms_rotation_crc.c

I will add it in my v2 when the rest of the series is reviewed:

	if (is_intel_device(data->gfx_fd)) {
		modifier = data->override_modifier ?: I915_FORMAT_MOD_Y_TILED;
	}

This way the rotation tests can be run for vkms too.