ila: Flush netlink command to clear xlat table

Add ILA_CMD_FLUSH netlink command to clear the ILA translation table.

Signed-off-by: Tom Herbert <tom@quantonium.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/ila.h

@@ -30,6 +30,7 @@ enum {
 	ILA_CMD_ADD,
 	ILA_CMD_DEL,
 	ILA_CMD_GET,
+	ILA_CMD_FLUSH,
 
 	__ILA_CMD_MAX,
 };