Don't override the vop_lock, vop_unlock and vop_isunlocked methods.

Previously all filesystems which relied on specfs to do devices
would have private overrides for vop_std*, so the vop_no* overrides
here had no effect.  I overlooked the transitive nature of the vop
vectors when I removed the vop_std* in those filesystems.

Removing the override here restores device node locking to it's
previous modus operandi.

Spotted by:	bde

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