arm64: dts: rockchip: remove rk3588 optee node

arm64: dts: rockchip: remove rk3588 optee node

Remove Optee node from rk3588 devicetree. When Optee is present and
used the node will be added automatically by U-Boot when
CONFIG_OPTEE_LIB=y and CONFIG_SPL_ATF_NO_PLATFORM_PARAM is not set.
When Optee is not present or used, the node will trigger a probe
that generates a (harmless) message on the kernel log.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Link: https://lore.kernel.org/r/20250130181005.6319-1-macroalpha82@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>