locking: Move the rwsem code to kernel/locking/

Notably: changed lib/rwsem* targets from lib- to obj-, no idea about
the ramifications of that.

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-g0kynfh5feriwc6p3h6kpbw6@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/rwsem-spinlock.c
Simple merge

diff --cc kernel/locking/rwsem-xadd.c
Simple merge

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

diff --cc lib/Makefile
Simple merge