dt-bindings: interrupt-controller: Add support for ASPEED AST27XX INTC

dt-bindings: interrupt-controller: Add support for ASPEED AST27XX INTC

The ASPEED AST27XX interrupt controller(INTC) contains second level and
third level interrupt controller.

INTC0:
The second level INTC, which used to assert GIC if interrupt in INTC1 asserted.

INTC1_x:
The third level INTC, which used to assert INTC0 if interrupt in modules
of INTC asserted.

The relationship is like the following:
  +-----+   +-------+     +---------+---module0
  | GIC |---| INTC0 |--+--| INTC1_0 |---module1
  |     |   |       |  |  |         |---...
  +-----+   +-------+  |  +---------+---module31
                       |
                       |   +---------+---module0
                       +---| INTC1_1 |---module1
                       |   |         |---...
                       |   +---------+---module31
                      ...
                       |   +---------+---module0
                       +---| INTC1_5 |---module1
                           |         |---...
                           +---------+---module31

Signed-off-by: Kevin Chen <kevin_chen@aspeedtech.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/all/20241016022410.1154574-2-kevin_chen@aspeedtech.com