soc: rockchip: add header for suspend mode SIP interface

Add ROCKCHIP_SIP_SUSPEND_MODE to pass down parameters to Trusted Firmware
in order to decide suspend mode. Currently only add ROCKCHIP_SLEEP_PD_CONFIG
which teaches firmware to power down controllers or not.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/1738736156-119203-3-git-send-email-shawn.lin@rock-chips.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>