wpan-phy: allow specifying a per-page channel mask

IEEE 802.15.4-2006 defines channel pages that hold channels (max 32 pages,
27 channels per page). Allow the driver to specify supported channels
on pages, other than the first one.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
diff --git a/include/net/wpan-phy.h b/include/net/wpan-phy.h
index 3367dd9..7b7fc58 100644
--- a/include/net/wpan-phy.h
+++ b/include/net/wpan-phy.h
@@ -34,7 +34,7 @@
 	 */
 	u8 current_channel;
 	u8 current_page;
-	u32 channels_supported;
+	u32 channels_supported[32];
 	u8 transmit_power;
 	u8 cca_mode;