powerpc: t2080rdb: Enable RTC support

The T2080RDB has a ds1339 on i2c0. Add this to the devicetree and enable
the relevant support in the configs.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
5 files changed