staging: wilc1000: avoid use of static variable in linux_mon.c

Define local variable for 'srcadd' & 'bssid' static variables and use
ether_addr_copy() to copy value into them.

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>