tc2: multi_v7_defconfig: add board support configs

For Arm:
  Add       ARM vexpress-spc cpufreq driver
  Add       ARM Big.Little cpuidle driver
  Add       Sensor Vexpress
  Add       Schedutil as default governor
  Built-in  CPUfreq governors

Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>