staging: wilc1000: remove unused defines

This patch removes follwing unused defines.
MAX_CFG_PKTLEN
MSG_HEADER_LEN
QUERY_MSG_TYPE
WRITE_MSG_TYPE
RESP_MSG_TYPE
WRITE_RESP_SUCCESS
INVALID
MAC_ADDR_LEN

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>