arm64: dts: rockchip: Add rk3576 SoC base DT

This device tree contains all devices necessary for booting from network
or SD Card.

It supports CPU, CRU, PM domains, dma, interrupts, timers, UART, I2C
and SDHCI (everything necessary to boot Linux on this system on chip)
as well as Ethernet, SPI, GPU and RTC.

Signed-off-by: Liang Chen <[email protected]>
Signed-off-by: Finley Xiao <[email protected]>
Signed-off-by: Yifeng Zhao <[email protected]>
Signed-off-by: Elaine Zhang <[email protected]>
Signed-off-by: Detlev Casanova <[email protected]>
Tested-by: Liang Chen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Stuebner <[email protected]>

Author: cazou