i.mx7d: pci: Update PCI IRQ mapping to match HW

i.mx7d: pci: Update PCI IRQ mapping to match HW

Datasheet for i.MX7 is incorrect and i.MX7's PCI IRQ mapping matches
that of i.MX6:

    * INTD/MSI    122
    * INTC        123
    * INTB        124
    * INTA        125

Fix all of the relevant code to reflect that fact. Needed by latest
Linux kernels.

(Reference: Linux kernel commit 538d6e9d597584e80 from an
NXP employee confirming that the datasheet is incorrect and
with a report of a test against hardware.)

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: qemu-devel@nongnu.org
Cc: qemu-arm@nongnu.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
[PMM: added ref to kernel commit confirming the datasheet error]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>