locking: Move the spinlock code to kernel/locking/

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-b81ol0z3mon45m51o131yc9j@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --cc kernel/Makefile
Simple merge

diff --cc kernel/locking/Makefile
Simple merge

diff --cc kernel/locking/spinlock.c
Simple merge

diff --cc kernel/locking/spinlock_debug.c
Simple merge

diff --cc lib/Makefile
Simple merge