Only increase SMP for CrosVM HelloWorld tests

We increased number of QEMU-emulated CPUs from 2 to 4 to increase
chances of discovering concurrency issues but since Make runs `nproc`
jobs simultaneously, the system starts thrashing.

Reduce number of CPUs back down to 2 by default but keep 4 for CrosVM
HelloWorld tests. This covers boot and spawning a guest VM, at least.

Change-Id: Id45dd87ab94e6df4003443ea7f874157297f3779
2 files changed
tree: 5b4afc2217a1b958b26585ca6cc051b09a51035f
  1. aarch64/
  2. crosvm/
  3. cuttlefish/
  4. kvm-unit-tests/
  5. common.inc
  6. Makefile