drivers: rtc: Add support for Epson RX8130CE RTC driver

This commit introduces a driver for the Epson RX8130CE rtc.
The driver provides the following functionalities:

- Time setting and retrieval
- Periodic update interrupt support (1Hz)
- Alarm setting and retrieval (minute, hour, day)
- Frequency output control (32.768kHz, 1.024kHz, 1Hz, off)
- Power management (automatic power switching & battery charging)
- Calibration setting and retrieval

Signed-off-by: Måns Ansgariusson <Mansgariusson@gmail.com>