[U-Boot] [U-Boot, v1] rockchip: defconfig: puma-rk3399: enable RTC

[Philipp Tomsich]

> commit: 52280315a4 ("rtc: rewrite isl1208 to support DM") enables us to
> use the on-module RTC emulation with the rk3399 device model i2c driver.
> 
> Signed-off-by: Klaus Goger <klaus.goger at theobroma-systems.com>
> ---
> 
>  configs/puma-rk3399_defconfig | 2 ++
>  1 file changed, 2 insertions(+)
> 

Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>