Add @Nullable to Object#equals()

This is a partial cherry-pick of change:
I5eedb571c9d78862115dfdc5dae1cf2a35343580

for connectivity classes.

Bug: 170883422
Test: m
Merged-In: I5eedb571c9d78862115dfdc5dae1cf2a35343580
Change-Id: I7dc661863b73f4198ddb4f3a1566583d0f07db3c
diff --git a/framework/src/android/net/IpConfiguration.java b/framework/src/android/net/IpConfiguration.java
index 0b20564..d5f8b2e 100644
--- a/framework/src/android/net/IpConfiguration.java
+++ b/framework/src/android/net/IpConfiguration.java
@@ -167,7 +167,7 @@
     }
 
     @Override
-    public boolean equals(Object o) {
+    public boolean equals(@Nullable Object o) {
         if (o == this) {
             return true;
         }