misc: rtsx: modify en/disable aspm function

enable/disable device ASPM function:
changed write ASPM configuration directly to use write register

Signed-off-by: Ricky Wu <ricky_wu@realtek.com>
Link: https://lore.kernel.org/r/20201202063124.18262-1-ricky_wu@realtek.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>