ARM: dts: rockchip: Add missing arm timer interrupt for RK3128

The Cortex-A7 timer has 4 interrupts.
Add the missing one.

Fixes: a0201bff

 ("ARM: dts: rockchip: add rk3128 soc dtsi")
Signed-off-by: Alex Bee <knaerzche@gmail.com>
Link: https://lore.kernel.org/r/20230829203721.281455-8-knaerzche@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>