scsi: ufs: core: Do not open code read_poll_timeout

ufshcd_wait_for_register() practically does just that - replace with
read_poll_timeout.

Signed-off-by: Avri Altman <avri.altman@wdc.com>
Link: https://lore.kernel.org/r/20240919112442.48491-1-avri.altman@wdc.com


Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>