ARM: dts: msm: Remove CPU and reserved memory for trustedvm

The reserved memory nodes will be generated and overlayed at runtime
when the trustedvm is started. Remove these nodes from the base device
tree.

In addition, reduce the cpu core usage by changing the vcpu vmconfig
and removing the nodes for CPU[2..7].

Change-Id: I24e66bcc87621289b093e2d6781e201b18430029