locking: Convert raw_rwlock to arch_rwlock

Not strictly necessary for -rt as -rt does not have non sleeping
rwlocks, but it's odd to not have a consistent naming convention.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: linux-arch@vger.kernel.org

diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index de3a022..53bc221 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -8,7 +8,7 @@
  *
  * on SMP builds:
  *
- *  asm/spinlock_types.h: contains the arch_spinlock_t/raw_rwlock_t and the
+ *  asm/spinlock_types.h: contains the arch_spinlock_t/arch_rwlock_t and the
  *                        initializers
  *
  *  linux/spinlock_types.h:
@@ -75,7 +75,7 @@
 #define __lockfunc __attribute__((section(".spinlock.text")))
 
 /*
- * Pull the arch_spinlock_t and raw_rwlock_t definitions:
+ * Pull the arch_spinlock_t and arch_rwlock_t definitions:
  */
 #include <linux/spinlock_types.h>