ARM: dts: suniv: F1C100: fix timer node

The Allwinner F1C100s has three timer instances, each with their own
interrupt line.

Add the missing two interrupts to the DT node, to match the DT binding.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20220317162349.739636-8-andre.przywara@arm.com