simpleperf: add symbol filter for report command.

By adding --symbols option, we can report for selected functions.
It helps to filter out functions we don't care, especially when
we are using `simpleperf report --sort vaddr_in_file` to profile
inside a function.

Bug: 29826956

Change-Id: I4de9dfe1a376db097f6163aa780a079cbc33689a
2 files changed