[XFS] Unwrap mru_lock.
[XFS] Unwrap mru_lock.

Un-obfuscate mru_lock, remove mutex_lock->spin_lock macros, call spin_lock
directly, remove extraneous cookie holdover from old xfs code.

SGI-PV: 970382
SGI-Modid: xfs-linux-melb:xfs-kern:29745a

Signed-off-by: Eric Sandeen <d55521028c14e0f378be5444e4ea388161c0d7e7@sandeen.net>
Signed-off-by: Donald Douwsma <5325b2bc7fbd15ae4ba55fa3b814092405dd005b@sgi.com>
Signed-off-by: Tim Shimmin <d1c056a983786a38ca76a05cda240c7b86d77136@sgi.com>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas