libmemtrack: Refine the feature define

Use appropriate name for the feature define.

Change-Id: If6b6f63a24c84f916f26043ad776084f3723137d
diff --git a/libmemtrack/memtrack_msm.h b/libmemtrack/memtrack_msm.h
index ff2db3c..74aa576 100644
--- a/libmemtrack/memtrack_msm.h
+++ b/libmemtrack/memtrack_msm.h
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef _MEMTRACK_QCOM_H_
-#define _MEMTRACK_QCOM_H_
+#ifndef _MEMTRACK_MSM_H_
+#define _MEMTRACK_MSM_H_
 
 int kgsl_memtrack_get_memory(pid_t pid, enum memtrack_type type,
                              struct memtrack_record *records,