scsi: ufs: Make ufshcd_wait_for_register() sleep instead of busy-waiting

The ufshcd_wait_for_register() function either sleeps or spins until the
specified register has reached the desired value. Busy-waiting is not only
considered a bad practice but also has a bad impact on energy
consumption. Always sleep instead of spinning by making sure that all
ufshcd_wait_for_register() calls happen from a context where it is allowed
to sleep. The only function call that has to be moved is the
ufshcd_hba_stop() call in ufshcd_host_reset_and_restore().

Link: https://lore.kernel.org/r/[email protected]
Cc: Can Guo <[email protected]>
Cc: Avri Altman <[email protected]>
Cc: Bean Huo <[email protected]>
Cc: Alim Akhtar <[email protected]>
Cc: Asutosh Das <[email protected]>
Tested-by: Bean Huo <[email protected]>
Reviewed-by: Stanley Chu <[email protected]>
Reviewed-by: Bean Huo <[email protected]>
Reviewed-by: Asutosh Das <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

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