ARM: dts: msm: Add MHI and PCIe configuration

Additional config added to LE CPE platform

Depends-on: 2872043
Change-Id: I56e06d4c5a499f0303dda84881a78b444a587e86
Acked-by: Gajendra Singh <gajendra@qti.qualcomm.com>
Signed-off-by: Aman Gupta <amangupt@codeaurora.org>