Merge branch 'mt7621-dt'

Arınç ÜNAL says:

====================
dt-bindings and mt7621 devicetree changes

This patch series removes old MediaTek bindings, improves mediatek,mt7530
and mt7621 memory controller bindings and improves mt7621 DTs.

v4:
- Keep memory-controller node name.
- Change syscon to memory-controller on mt7621.dtsi.

v3:
- Explain the mt7621 memory controller binding change in more details.
- Remove explaining the remaining DTC warnings from the patch log as there
are new schemas submitted for them.

v2:
- Change memory controller node name to syscon on the schema example.
- Keep cpu compatible string and syscon on the memory controller node.
- Add Rob and Sergio's tags.
====================

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