Update language to comply with Android's inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code
for reference.

Test: m ; atest TetheringTests
Bug: 161896447
Change-Id: Idc58697c72fb00896bee00185fefc50c1a24dd35
diff --git a/Tethering/src/android/net/util/TetheringMessageBase.java b/Tethering/src/android/net/util/TetheringMessageBase.java
index 1b763ce..29c0a81 100644
--- a/Tethering/src/android/net/util/TetheringMessageBase.java
+++ b/Tethering/src/android/net/util/TetheringMessageBase.java
@@ -19,7 +19,7 @@
  * This class defines Message.what base addresses for various state machine.
  */
 public class TetheringMessageBase {
-    public static final int BASE_MASTER   = 0;
+    public static final int BASE_MAIN_SM   = 0;
     public static final int BASE_IPSERVER = 100;
 
 }