arm64: dts: rockchip: Add basic support for Kobol's Helios64

arm64: dts: rockchip: Add basic support for Kobol's Helios64

Origin: https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git/patch/?id=09e006cfb43e8ec38afe28278b210dab72e6cac8

The hardware is described in detail on Kobol's wiki at
https://wiki.kobol.io/helios64/intro/.

Up to now the following peripherals are working:

 - UART
 - Micro-SD card
 - eMMC
 - ethernet port 1
 - status LED
 - temperature sensor on i2c bus 2

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Link: https://lore.kernel.org/r/20201014200030.845759-3-uwe@kleine-koenig.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Gbp-Pq: Topic features/arm64
Gbp-Pq: Name arm64-dts-rockchip-Add-basic-support-for-Kobol-s-Hel.patch