rtc: ds1307: add OF and ACPI entries for Epson RX8130

Make Epson RX8130 device tree and ACPI aware.

Fixes: ee0981be

 ("rtc: ds1307: Add support for Epson RX8130CE")
Signed-off-by: Bastian Stender <bst@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>