Required properties:
-------------------
-- compatible: should be "ti,k2g-sci"
+- compatible: should be "ti,k2g-sci" for TI 66AK2G SoC
+ should be "ti,am654-sci" for for TI AM654 SoC
- mbox-names:
"rx" - Mailbox corresponding to receive path
"tx" - Mailbox corresponding to transmit path