linux-phytec-fsl

rtc: rv8803: Kconfig: Indicate rx8900 support

This driver supports the Epson RX8900, but this was not indicated in
Kconfig.

Signed-off-by: Benoît Thébaudeau <benoit@wsystem.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>