mb/google/kahlee/mainboard.c: Create mainboard_pirq_data

When booting kahlee, there's an error message: "Warning: Can't write PCI
IRQ assignments because 'mainboard_pirq_data' structure does not exist".
This is generated by write_pci_cfg_irqs due to missing mainboard_pirq_data.

TEST=Build and boot kahlee. Warning message must be gone.

Change-Id: If07d2f54f06f6cf77566c43eddc8ee8a314e7a3a
Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-on: https://review.coreboot.org/22940
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed