Perfprofd: Work around simpleperf temp dir expectations

It is hard to give perfprofd access to /data/local/tmp, where
simpleperf wants to write a temp file. For now, make sure that
the fallback works by changing the current working directory
before executing.

Bug: 70232908
Test: m
Test: manual
Change-Id: I17c68573786a4b651cf4a77574887c22e4de97b7
1 file changed