dts: arm: viper: m7: Add PVM interrupts for pcie node

MSI-X PVM feature requires snoop interrupt for tracking configuration
space register (msix_cap) update and PCIe PMON lite interrupt for
tracking MSI-X table update. Add both the interrupts for Viper M7 DT.

Signed-off-by: Abhishek Shah <abhishek.shah@broadcom.com>