Squashed 'external/devlib/' changes from 5d342044a..b6d1863e7

b6d1863e7 collector/dmesg: DmesgCollector: Avoid not rooted targets
bbc891341 module/cpufreq: Warn when cpuinfo doesn't reflect the cpufreq request
d14df074e utils/android: Fix Typo
81f9ee2c5 utils/android: Use busybox implementation of ps
09d0a0f50 docs: Fix Formatting / typos
fe2fe3ae0 collector/perf: run simpleperf report-sample in the target if requested
4859e818f collector/perf: Only kill sleep if running perf stat

git-subtree-dir: external/devlib
git-subtree-split: b6d1863e77ff5aa07466c835b88fb8be94d6dd97