Add dumpsys cpuinfo proto

Add protobuf dumpsys of cpuinfo, invoked by dumpsys cpuinfo --proto.
Also add "dumpsys cpuinfo --proto" section to incident.proto

Bug: 146086163
Test: adb shell dumpsys cpuinfo --proto, then verify its content
Change-Id: I84ed623dee9708e36c75d8effb71408401e0dac0