Adjust pcmlog_{initialize,shutdown}() definitions to avoid clang 15 warning
With clang 15, the following -Werror warnings are produced:
sys/dev/hwpmc/hwpmc_logging.c:1228:18: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes] pmclog_initialize() ^ void sys/dev/hwpmc/hwpmc_logging.c:1277:16: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes] pmclog_shutdown() ^ void
This is because pcmlog_{initialize,shutdown}() are declared with (void)
argument lists, but defined with empty argument lists. Make the
definitions match the declarations.
MFC after: 3 days