mac802154: ops: declare channel and page as u8

The range of channel and page fits into an unsigned byte range. This
patch changes the set_channel parameter definitions for channel and
page to u8.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Cc: Alan Ott <alan@signal11.us>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/drivers/net/ieee802154/cc2520.c b/drivers/net/ieee802154/cc2520.c
index b479c9d..78ea2ca 100644
--- a/drivers/net/ieee802154/cc2520.c
+++ b/drivers/net/ieee802154/cc2520.c
@@ -569,7 +569,7 @@
 }
 
 static int
-cc2520_set_channel(struct ieee802154_hw *hw, int page, int channel)
+cc2520_set_channel(struct ieee802154_hw *hw, u8 page, u8 channel)
 {
 	struct cc2520_private *priv = hw->priv;
 	int ret;