locking: Remove superfluous sentinel element from kern_lockdep_table

locking: Remove superfluous sentinel element from kern_lockdep_table

This commit is part of a greater effort to remove all
empty elements at the end of the ctl_table arrays (sentinels) which will
reduce the overall build time size of the kernel and run time memory
bloat by ~64 bytes per sentinel (further information Link :
https://lore.kernel.org/all/ZO5Yx5JFogGi%2FcBo@bombadil.infradead.org/)

Signed-off-by: Joel Granados <j.granados@samsung.com>