arm64: dts: allwinner: enable h616 timer support

arm64: dts: allwinner: enable h616 timer support

Add support for timer by reusing existing sun4i timer driver.

H616 timer is compatible with earlier sunxi timer variants and provides
both clocksource and clockevent functionality. It runs from 24 MHz
oscillator. It can serve as broadcast clockevent for wake up from idle
states.

Tested on Orange Pi Zero 3:
- timer is registered as clocksource:
- switching clocksource at runtime works
- timer operates as a broadcast clockevent device
- no regression observed compared to arch_sys_counter

Signed-off-by: Michal Piekos <michal.piekos@mmpsystems.pl>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://patch.msgid.link/20260329-h616-timer-v1-1-5966d0420a66@mmpsystems.pl
Signed-off-by: Chen-Yu Tsai <wens@kernel.org>