linux-ramdump-parser-v2: Add support for --check-for-panic on arm64

--check-for-panic works by scanning the stacks of each task and finding
a pc that matches 'panic'. arm64 and arm have different stack disciplines
so the scanning code needs to account for this. Update this to work
with both arm and arm64.

Change-Id: I65f05156c51c117713a6dd0e87ca71fd09e17568