at86rf230: add default channel settings

This patch sets the reset state channels accoridng at86rf2xx datasheets.
We don't need to set the default page here which is zero on all chips.

Signed-off-by: Alexander Aring <[e-mail]>
Signed-off-by: Marcel Holtmann <[e-mail]>

drivers/net/ieee802154/at86rf230.c

···
 		chip = "at86rf231";
 		lp->data = &at86rf231_data;
 		lp->hw->phy->channels_supported[0] = 0x7FFF800;
+		lp->hw->phy->current_channel = 11;
 		break;
 	case 7:
 		chip = "at86rf212";
···
 			lp->hw->flags |= IEEE802154_HW_LBT;
 			lp->hw->phy->channels_supported[0] = 0x00007FF;
 			lp->hw->phy->channels_supported[2] = 0x00007FF;
+			lp->hw->phy->current_channel = 5;
 		} else {
 			rc = -ENOTSUPP;
 		}
···
 		chip = "at86rf233";
 		lp->data = &at86rf233_data;
 		lp->hw->phy->channels_supported[0] = 0x7FFF800;
+		lp->hw->phy->current_channel = 13;
 		break;
 	default:
 		chip = "unkown";