ARM: dts: msm: remove Synopsys MSI IRQ from PCIe nodes for sm8150

To support Synopsys MSI, its IRQ should be managed by MSI
controller instead of PCIe root complex. Remove Synopsys
MSI from PCIe nodes for sm8150.

Change-Id: Ib7a840b63031a00f003a9990fb1379f9b1d67139
Signed-off-by: Tony Truong <truong@codeaurora.org>