Add initial support for Ingenic X1000 SoC and Y&A CU Neo board v3.

Subject: Add initial support for Ingenic X1000 SoC and Y&A CU Neo board v3.
From: Zhou Yanjie <zhouyanjie@xxxxxxxx>
Date: Sun, 24 Nov 2019 22:58:58 +0800
Cc: linux-kernel@xxxxxxxxxxxxxxx, devicetree@xxxxxxxxxxxxxxx, robh+dt@xxxxxxxxxx, paul.burton@xxxxxxxx, paulburton@xxxxxxxxxx, jhogan@xxxxxxxxxx, mripard@xxxxxxxxxx, shawnguo@xxxxxxxxxx, mark.rutland@xxxxxxx, syq@xxxxxxxxxx, ralf@xxxxxxxxxxxxxx, heiko@xxxxxxxxx, icenowy@xxxxxxx, laurent.pinchart@xxxxxxxxxxxxxxxx, krzk@xxxxxxxxxx, geert+renesas@xxxxxxxxx, paul@xxxxxxxxxxxxxxx, prasannatsmkumar@xxxxxxxxx, sernia.zhou@xxxxxxxxxxx, zhenwenjin@xxxxxxxxx, 772753199@xxxxxx

v2->v3:
Drop the "apb" node in x1000.dtsi

Follow-Ups:
- [PATCH v3 4/4] MIPS: Ingenic: Initial YSH & ATIL CU Neo board. support.
  - From: Zhou Yanjie
- [PATCH v3 3/4] dt-bindings: MIPS: Add Ingenic XBurst based boards.
  - From: Zhou Yanjie
- [PATCH v3 2/4] dt-bindings: Document yna vendor-prefix.
  - From: Zhou Yanjie
- [PATCH v3 1/4] MIPS: Ingenic: Initial X1000 support.
  - From: Zhou Yanjie