hw/intc/aspeed: Refactor INTC to support separate input and output pin indices

hw/intc/aspeed: Refactor INTC to support separate input and output pin indices

Refactors the INTC to distinguish between input and output pin indices,
improving interrupt handling clarity and accuracy.

Updated the functions to handle both input and output pin indices.
Added detailed logging for input and output pin indices in trace events.

These changes ensure that the INTC controller can handle multiple input and
output pins, improving support for the AST2700 A1.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250307035945.3698802-14-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>