[PATCH v2 5/5] dt-bindings: interrupt-controller: aspeed: Remove AST2700-A0 support

[Ryan Chen]

The existing AST2700 interrupt controller binding
("aspeed,ast2700-intc-ic") was written against the A0 pre-production
design.

In A0, the interrupt hierarchy effectively converged at the Primary
Service Processor (PSP): INTC1 instances fed into INTC0, and INTC0 was
wired to the PSP GIC. The binding therefore described a fixed, PSP
aggregation model.