dt-bindings: rtc: Add Epson RX8111

Epson RX8111 is an RTC with timestamp functionality. Add devicetree
bindings requiring the compatible string and I2C slave address (reg)
through `trivial-rtc.yaml`.
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Waqar Hameed <waqar.hameed@axis.com>
Link: https://lore.kernel.org/r/4823f303ec8308762430f4f3aaa462be20baef54.1700491765.git.waqar.hameed@axis.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Documentation/devicetree/bindings/rtc/trivial-rtc.yaml

@@ -40,6 +40,7 @@ properties:
       - epson,rx8025
       - epson,rx8035
       # I2C-BUS INTERFACE REAL TIME CLOCK MODULE with Battery Backed RAM
+      - epson,rx8111
       - epson,rx8571
       # I2C-BUS INTERFACE REAL TIME CLOCK MODULE
       - epson,rx8581