arm: rockchip: sync ROCK Pi 4A DTS from Linux

To prepare for ROCK Pi 4A SPI flash support, sync the DTS from Linux which
includes an SPI flash node.

Kernel tag: v6.6-rc1
Kernel commits:
 - eddf73029770 ("arm64: dts: rockchip: Enable internal SPI flash for ROCK \
                  Pi 4A/B/C")

Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Signed-off-by: Christopher Obbard <chris.obbard@collabora.com>
Reviewed-by: Jonas Karlman <jonas@kwiboo.se>