arm: mach-k3: j721e: dev-data: Add mcu_timer0 ID

U-Boot uses mcu_timer0 as the tick-timer, so add it to device list.

Signed-off-by: Neha Malcom Francis <n-francis@ti.com>
Reviewed-by: Manorit Chawdhry <m-chawdhry@ti.com>
Reviewed-by: Nishanth Menon <nm@ti.com>