remove extra semicolons [-Wextra-semi]

Bug: n/a
Test: no errors with -Werror,-Wextra-semi
Change-Id: If523cadea4c6f02a9155fb7482ba5463fff7854a
diff --git a/libs/binder/Android.bp b/libs/binder/Android.bp
index f4f036e..ee0259d 100644
--- a/libs/binder/Android.bp
+++ b/libs/binder/Android.bp
@@ -144,6 +144,7 @@
     cflags: [
         "-Wall",
         "-Wextra",
+        "-Wextra-semi",
         "-Werror",
         "-Wzero-as-null-pointer-constant",
         "-DANDROID_BASE_UNIQUE_FD_DISABLE_IMPLICIT_CONVERSION",