cxl: Fix use of phys_to_target_node() for x86

cxl: Fix use of phys_to_target_node() for x86

The CXL driver uses both functions phys_to_target_node() and
memory_add_physaddr_to_nid(). The x86 architecture relies on the
NUMA_KEEP_MEMINFO kernel option enabled for both functions to work
correct. Update Kconfig to make sure the option is always enabled for
the driver.

Suggested-by: Dan Williams <dan.j.williams@intel.com>
Link: http://lore.kernel.org/r/65f8b191c0422_aa222941b@dwillia2-mobl3.amr.corp.intel.com.notmuch
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Robert Richter <rrichter@amd.com>
Link: https://lore.kernel.org/r/20240424154756.2152614-1-rrichter@amd.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>