Include <sys/mutex.h> and its prerequisite <sys/lock.h> instead of depending on namespace pollution in <sys/buf.h> and/or <sys/vnode.h>
Include <sys/mutex.h> and its prerequisite <sys/lock.h> instead of
depending on namespace pollution in <sys/buf.h> and/or <sys/vnode.h>

Approved by:	re (kensmith) (blanket)

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