ARM: dts: Fix NAS4220B pin config

ARM: dts: Fix NAS4220B pin config

The DTS file for the NAS4220B had the pin config for the
ethernet interface set to the pins in the SL3512 SoC while
this system is using SL3516. Fix it by referencing the
right SL3516 pins instead of the SL3512 pins.

Cc: [email protected]
Cc: Hans Ulli Kroll <[email protected]>
Reported-by: Andreas Fiedler <[email protected]>
Reported-by: Roman Yeryomin <[email protected]>
Tested-by: Roman Yeryomin <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>