cxl/pci: Drop wait_for_valid() from cxl_await_media_ready()

A check mem_info_valid already happens in __cxl_dvsec_ranges(). Rely on
that instead of calling wait_for_valid again.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/165291686632.1426646.7479581732894574486.stgit@dwillia2-xfh


Signed-off-by: Dan Williams <dan.j.williams@intel.com>