net: sunhme: Fix region request

devm_request_region is for I/O regions. Use devm_request_mem_region
instead.  This fixes the driver failing to probe since 99df45c9
("sunhme: fix an IS_ERR() vs NULL check in probe"), which checked the
result.

Fixes: 914d9b27

 ("sunhme: switch to devres")
Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Link: https://lore.kernel.org/r/20230222204242.2658247-1-seanga2@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>