tests/i915/gem_lmem_swapping: run only for discrete platform

Testsuit only meant to be run on discrete platforms and skip
with right reason on other platforms.

changes since V1:
	- Change position of gem_has_lmem(i915) check - Zbigniew

Reviewed-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@intel.com>

tests/i915/gem_lmem_swapping.c

@@ -521,6 +521,7 @@ igt_main_args("", long_options, help_str, opt_handler, NULL)
 
 		i915 = drm_open_driver(DRIVER_INTEL);
 		igt_require_gem(i915);
+		igt_require(gem_has_lmem(i915));
 
 		regions = gem_get_query_memory_regions(i915);
 		igt_require(regions);