shared across all System Controller members.
System Timer (ST) required properties:
-- compatible: Should be "atmel,at91rm9200-st"
+- compatible: Should be "atmel,at91rm9200-st", "syscon", "simple-mfd"
- reg: Should contain registers location and length
- interrupts: Should contain interrupt for the ST which is the IRQ line
shared across all System Controller members.
+Its subnodes can be:
+- watchdog: compatible should be "atmel,at91rm9200-wdt"
TC/TCLIB Timer required properties:
- compatible: Should be "atmel,<chip>-tcb".