ARM: dts: msm: Enable SLPI, SMMU, and USB entries for SA8155 VM

Enable device tree entries for SLPI pinctrl, APPS SMMU, and USB
for the SA8155 VM.

Change-Id: I38cf3e949923b81ef4e4ed8e80bbabebc17c5bfc
Signed-off-by: Anant Goel <anantg@codeaurora.org>