Introduce SMP support for CI20 (based on JZ4780) v3.

Subject: Introduce SMP support for CI20 (based on JZ4780) v3.
From: 周琰杰 (Zhou Yanjie) <zhouyanjie@xxxxxxxxxxxxxx>
Date: Fri, 24 Jan 2020 20:05:01 +0800
Cc: linux-kernel@xxxxxxxxxxxxxxx, devicetree@xxxxxxxxxxxxxxx, robh+dt@xxxxxxxxxx, paul.burton@xxxxxxxx, paulburton@xxxxxxxxxx, jhogan@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, daniel.lezcano@xxxxxxxxxx, shawnguo@xxxxxxxxxx, mark.rutland@xxxxxxx, syq@xxxxxxxxxx, ralf@xxxxxxxxxxxxxx, miquel.raynal@xxxxxxxxxxx, keescook@xxxxxxxxxxxx, ebiederm@xxxxxxxxxxxx, krzk@xxxxxxxxxx, geert+renesas@xxxxxxxxx, paul@xxxxxxxxxxxxxxx, prasannatsmkumar@xxxxxxxxx, sernia.zhou@xxxxxxxxxxx, zhenwenjin@xxxxxxxxx, mturquette@xxxxxxxxxxxx, sboyd@xxxxxxxxxx, chenhc@xxxxxxxxxx, jiaxun.yang@xxxxxxxxxxx, paul@xxxxxxxxxxxxx, hns@xxxxxxxxxxxxx, mips-creator-ci20-dev@xxxxxxxxxxxxxxxx, rick.tyliu@xxxxxxxxxxx

Introduce SMP support for MIPS Creator CI20, which is
based on Ingenic JZ4780 SoC.

Happy Chinese New Year!

Follow-Ups:
- [PATCH v3 2/6] clocksource: Ingenic: Add high resolution timer support for SMP.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v3 6/6] MIPS: CI20: Update defconfig to support SMP.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v3 4/6] MIPS: Ingenic: Add 'cpus' node for Ingenic SoCs.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v3 3/6] dt-bindings: MIPS: Document Ingenic SoCs binding.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v3 1/6] MIPS: JZ4780: Introduce SMP support.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v3 5/6] MIPS: CI20: Modify DTS to support high resolution timer for SMP.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v3 0/6] Introduce SMP support for JZ4780.
  - From: 周琰杰 (Zhou Yanjie)