pmdomain: rockchip: Check if SMC could be handled by TA

Non-existent trusted-firmware could lead to SMC calls into some unset
location, that breaks the system. Let's check that it's supported before
executing the SMC.

Reported-by: Steven Price <steven.price@arm.com>
Suggested-by: Heiko Stuebner <heiko@sntech.de>
Fixes: 58ebba35 ("pmdomain: rockchip: Add smc call to inform firmware")
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Steven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/1739926689-151827-1-git-send-email-shawn.lin@rock-chips.com


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