Require `g_lock` in g_finish_switch()

While Linux will probably never run g_finish_switch() while we're
in edfsc_gschedule() on the same core, g_finish_switch() may run
simultaneously to an edfsc_gschedule() on a remote core. This may
not be safe, as requeue() modifies global data structures and is
currently called in g_finish_switch().

Make certain this is safe by obtaining `g_lock` for the whole
function. If future refactors remove the requeue() call from this
function, it is likely safe to revert this commit.

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