ARM: dts: msm: Add model specific configurations for SA8155 VMs

Add support to specify device configurations for individual virtual
machine models as the device configurations differ between virtual
machine models. This applies to virtual machine models based on the
SA8155 platform.

Change-Id: I4b6072356780d835924d004605fa41750c39255e
Signed-off-by: Anant Goel <anantg@codeaurora.org>