Use sigwaitinfo instead of sigwait when waiting for signals

sigwaitinfo also returns the siginfo_t that allows us to pass
additional information along with the signal number. Currently the
additional information is unused. This will be used when strting
long running method traces for ANR reports.

Bug: 352518093
Test: art/test.py
Change-Id: I19fc84b273a17a9b573ee41c545b4d4679ea9b39