ipynb/examples/trace_analysis: add kernel functions profiling example

This patch adds a new examples folder which is meant to collect
complete examples of some of the LISA's provided APIs.

A "complete examples" must provide:
1. a simple setup to run a workload on a Linux/Android target
2. a simple workload to actually execute on the target
3. a complete and exhaustive set of examples for the API demonstrated

This notebook provides a complete example for the usage of the kernel
functions profiling support provided by devlib.

Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>