cxl/region: Fix spelling mistake "memergion" -> "memregion"

There is a spelling mistake in a dev_warn message. Fix it.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20221205091819.1943564-1-colin.i.king@gmail.com


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