arm: dts: k3-j7200-r5-common: Add missing overrides for ringacc and udmap

Corrects the ti,sci property to point to dm_tifs node for proper
functioning of mcu_ringacc and mcu_udmap.

Fixes: df73e791 ("arm: dts: j7200: dts sync with Linux 6.6-rc1")
Signed-off-by: Aniket Limaye <a-limaye@ti.com>