arm64: dts: rockchip: add SPI support to helios64

add SPI support for the helios64, u-boot can live in spi1, spi2 is user
accessible, spi5 is for the sata controller rom.
https://wiki.kobol.io/helios64/spi/



Signed-off-by: Dennis Gilmore <dgilmore@redhat.com>
Link: https://lore.kernel.org/r/20210715025635.70452-3-dgilmore@redhat.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>