staging: wilc1000: delete function declaration SendRawPacket

SendRawpacket is declared but not implemented. It is not used also.
So just delete it.

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>