misc: rtsx: Cleanup power management ops

misc: rtsx: Cleanup power management ops

- Use cancel_delayed_work_sync to ensure there's no race with
  carddet_work.

- Remove device_wakeup_disable to save some CPU cycles. If the device
  really has ACPI _DSW then the wakeup should be disabled in probe
  routine.

- Remove fetch_vendor_settings from runtime resume routine, since they
  are already saved in "struct rtsx_pcr".

- Move variable assignments to the top of the functions.

Cc: Ricky WU <ricky_wu@realtek.com>
Tested-by: Ricky WU <ricky_wu@realtek.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Link: https://lore.kernel.org/r/20220125055010.1866563-3-kai.heng.feng@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>