staging: wilc1000: delete unused global variables.

gstrConfigPktInfo, SemHandleSendPkt and SemHandlePktResp are never used in
the drivers. So just delete the variables and it's related code.

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