Squashed 'external/devlib/' changes from c212ef214..0e6280ae3

0e6280ae3 ftrace: Ensure /proc/kallsyms contains symbol addresses
2650a534f exception: Fix DevlibError unpickling

git-subtree-dir: external/devlib
git-subtree-split: 0e6280ae3156e8a2b5e56e7c2d4288a79cde1687