Frameworks: Fix system server profiling

Avoid a race to close the profiling file descriptor.

(cherry picked from commit 5a8ea8c6)

Bug: 74883338
Test: m
Test: am profile start `pid system_server` /data/local/tmp/test.trace && sleep 5s && am profile stop `pid system_server` && adb pull /data/local/tmp/test.trace && [[ $(find test.trace -size +1K) ]] && echo Success
Merged-In: Ib506ce38ac1ac7c0b91079ba9b35aca6ae289d22
Change-Id: Ib506ce38ac1ac7c0b91079ba9b35aca6ae289d22