arch/tile: fix some comments and whitespace

This is a grab bag of changes with no actual change to generated code.
This includes whitespace and comment typos, plus a couple of stale
comments being removed.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
diff --git a/arch/tile/lib/atomic_asm_32.S b/arch/tile/lib/atomic_asm_32.S
index 5a5514b..82f64cc 100644
--- a/arch/tile/lib/atomic_asm_32.S
+++ b/arch/tile/lib/atomic_asm_32.S
@@ -14,7 +14,7 @@
  * Support routines for atomic operations.  Each function takes:
  *
  * r0: address to manipulate
- * r1: pointer to atomic lock guarding this operation (for FUTEX_LOCK_REG)
+ * r1: pointer to atomic lock guarding this operation (for ATOMIC_LOCK_REG)
  * r2: new value to write, or for cmpxchg/add_unless, value to compare against
  * r3: (cmpxchg/xchg_add_unless) new value to write or add;
  *     (atomic64 ops) high word of value to write