ieee802154: add LIST_PHY command support

Add nl802154 command to get information about PHY's present in
the system.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

include/linux/nl802154.h

@@ -65,6 +65,9 @@ enum {
 	IEEE802154_ATTR_SEC,
 
 	IEEE802154_ATTR_PAGE,
+	IEEE802154_ATTR_CHANNEL_PAGE_LIST,
+
+	IEEE802154_ATTR_PHY_NAME,
 
 	__IEEE802154_ATTR_MAX,
 };
@@ -114,6 +117,7 @@ enum {
 	IEEE802154_RX_ENABLE_CONF, /* Not supported yet */
 
 	IEEE802154_LIST_IFACE,
+	IEEE802154_LIST_PHY,
 
 	__IEEE802154_CMD_MAX,
 };