Merge branch 'lantiq-xrx300-xrx330'

Aleksander Jan Bajkowski says:

====================
net: dsa: lantiq: add support for xRX300 and xRX330

Changed since v3:
	* fixed last compilation warning

Changed since v2:
	* fixed compilation warnings
	* removed example bindings for xrx330
	* patches has been refactored due to upstream changes

Changed since v1:
	* gswip_mii_mask_cfg() can now change port 3 on xRX330
	* changed alowed modes on port 0 and 5 for xRX300 and xRX330
	* moved common part of phylink validation into gswip_phylink_set_capab()
	* verify the compatible string against the hardware
====================

Signed-off-by: David S. Miller <davem@davemloft.net>