Add rtc driver and bindigns for the amlogic A4(A113L2) and A5(A113X2) SoCs.

Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
---
Changes in v3:
- Perfect the binding description and rename binding.
- Using dev_err_probe function correctly, and modify commit message.
- Change placement about MAINTAINERS.
- Link to v2: https://lore.kernel.org/r/20240903-rtc-v2-0-05da5755b8d9@amlogic.com

Changes in v2:
- Modify bindings clock name and perfect the example.
- Fix some bug in driver, and use dev_err_probe instead of dev_err in probe process.
- Use RTC API to handle calibration.
- Remove unused func and rename driver file name.
- Link to v1: https://lore.kernel.org/r/20240823-rtc-v1-0-6f70381da283@amlogic.com

---
Yiting Deng (3):
      dt-bindings: rtc: Add Amlogic A4 and A5 RTC
      rtc: support for the Amlogic on-chip RTC
      MAINTAINERS: Add an entry for Amlogic RTC driver

 .../devicetree/bindings/rtc/amlogic,a4-rtc.yaml    |  63 +++
 MAINTAINERS                                        |   8 +
 drivers/rtc/Kconfig                                |  12 +
 drivers/rtc/Makefile                               |   1 +
 drivers/rtc/rtc-amlogic-a4.c                       | 473 +++++++++++++++++++++
 5 files changed, 557 insertions(+)
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base-commit: 658b3fec5fc0ef3c016c4a7eedac1a5f3b8c0151
change-id: 20240823-rtc-127cd8192a13

Best regards,
-- 
Xianwei Zhao <xianwei.zhao@amlogic.com>