staging: wilc1000: remove unused global variables

This patch removes the followings from the driver because they are in
debugging purpose but not used anymore.
- int_clrd
- int_rcvdU
- int_rcvdB
- android_wifi_priv_cmd structure

Signed-off-by: Tony Cho <tony.cho@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>