CONFIG_MAX_IRQ_LINES, PCIe, and riscv

[paulgfb]

Hello,

When attempting to build for a riscv system using PCIe on zephyr v2.7.0 or later, I get an error in the PCIe driver because CONFIG_MAX_IRQ_LINES is not defined.

Should that be natively in the source? Or is it something that should be added by platforms/systems that are built to use zephyr?

Thanks,
Paul Gautreaux