Simpleperf: Restrict callchain depth in inferno

Add an option to restrict the callchain depth in inferno, so as
to cope with deep stack that otherwise lead to a python stack
overflow.

Use a large value as a stand-in for unlimited. Try to capture
stack overflow and add a message to try the parameter.

Test: manual
Change-Id: I411b4210ad7ddb8c418a8142b0392df192111e06
2 files changed