Add support for the X1830 v4.

Subject: Add support for the X1830 v4.
From: 周琰杰 (Zhou Yanjie) <zhouyanjie@xxxxxxxxxxxxxx>
Date: Sun, 15 Dec 2019 23:21:32 +0800
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-clk@xxxxxxxxxxxxxxx, devicetree@xxxxxxxxxxxxxxx, robh+dt@xxxxxxxxxx, paul.burton@xxxxxxxx, paulburton@xxxxxxxxxx, paul@xxxxxxxxxxxxxxx, mturquette@xxxxxxxxxxxx, sboyd@xxxxxxxxxx, mark.rutland@xxxxxxx, sernia.zhou@xxxxxxxxxxx, zhenwenjin@xxxxxxxxx

v3->v4:
1.Remove the spinlock around ingenic_cgu_gate_get().
2.Merge [3/5] in v3 into [2/4] in v4.

Follow-Ups:
- [PATCH v4 1/4] clk: Ingenic: Remove unnecessary spinlock when reading registers.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v4 0/4] Add support for the X1830 v4
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v4 4/4] clk: Ingenic: Add CGU driver for X1830.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v4 3/4] dt-bindings: clock: Add X1830 bindings.
  - From: 周琰杰 (Zhou Yanjie)
- [PATCH v4 2/4] clk: Ingenic: Adjust cgu code to make it compatible with X1830.
  - From: 周琰杰 (Zhou Yanjie)