Qualify the source argument of atomic loads as a const pointer.

Also normalizes the opening brace placment in a few locations.

Change-Id: I8f518e933094337d5d3371321326ffc03b3a5f5a
diff --git a/include/cutils/atomic.h b/include/cutils/atomic.h
index 3866848..a50bf0f 100644
--- a/include/cutils/atomic.h
+++ b/include/cutils/atomic.h
@@ -77,8 +77,8 @@
  * This is only necessary if you need the memory barrier.  A 32-bit read
  * from a 32-bit aligned address is atomic on all supported platforms.
  */
-int32_t android_atomic_acquire_load(volatile int32_t* addr);
-int32_t android_atomic_release_load(volatile int32_t* addr);
+int32_t android_atomic_acquire_load(volatile const int32_t* addr);
+int32_t android_atomic_release_load(volatile const int32_t* addr);
 
 /*
  * Perform an atomic store with "acquire" or "release" ordering.