ARM: dts: msm: ensure contiguous MSI for PCIe on msmcobalt

PCIe MSI have to be contiguous by spec. Relocated
PCIe node so that it receives contiguous MSIs from
GIC driver.

Change-Id: Ia73ab1ba51df7b501d246bb45141018409496d01
Signed-off-by: Tony Truong <truong@codeaurora.org>