cxl/regs: Fix sparse warning

cxl/regs: Fix sparse warning

The 0day robot belatedly points out that @addr is not properly tagged as
an iomap pointer:

"drivers/cxl/core/regs.c:332:14: sparse: sparse: incorrect type in
assignment (different address spaces) @@     expected void *addr @@
got void [noderef] __iomem * @@"

Fixes: 1168271ca054 ("cxl/acpi: Extract component registers of restricted hosts from RCRB")
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Robert Richter <rrichter@amd.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://lore.kernel.org/r/167008768190.2516013.11918622906007677341.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>