ARM: dts: msm: Add model specific configurations for SA6155 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
SA6155 platform.

Change-Id: I6bc4c11013a050e9dbae3d8284b712bff96e3d8e
Signed-off-by: Vagdhan Kanukurthi <vagdhank@codeaurora.org>