r8152: fix the autosuspend doesn't work

Set supports_autosuspend = 1 for the rtl8152_cfgselector_driver.

Fixes: ec51fbd1

 ("r8152: add USB device driver for config selection")
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>