Revert "Fix the Wenum-constexpr-conversion error"

This reverts commit 7c275a89.

The clang-r547379 update removes the -Wenum-constexpr-conversion flag
and emits an error unconditionally (llvm.org/pr59036).

Bug: b/379133546
Test: m mediasyncevent_tests synchronizedrecordstate_tests
Change-Id: Ib896eb4dd46ee74bfd2d62d28f4d7cf6dd33e2a1