Fix WPS configuration method of BSS enrollee.

Remove keypad from WPS configuration method of BSS enrollee
becuase JB UI does NOT support keypad, only supports pbc and
display.

Change-Id: I9ab6f1514805e8307b46e38261f1c657568aeb59
Signed-off-by: Yoshihiko Ikenaga <yoshihiko.ikenaga@jp.sony.com>