gn2bp: ignore missing field initializers warning

Test: //base:base
Change-Id: I63f5fb2377408d3f1130e015bb019b1904cf7a65
diff --git a/tools/gn2bp/Android.bp.swp b/tools/gn2bp/Android.bp.swp
index 8b0f5df..da917e9 100644
--- a/tools/gn2bp/Android.bp.swp
+++ b/tools/gn2bp/Android.bp.swp
@@ -1739,6 +1739,7 @@
     cflags: [
         "-O2",
         "-Wno-error=return-type",
+        "-Wno-missing-field-initializers",
         "-Wno-non-virtual-dtor",
         "-Wno-sign-compare",
         "-Wno-sign-promo",