gn2bp: Set compile_multilibe: first to cc_object for gcc_processor.py

Test: ./update_results.sh, m cronet_aml_java
Change-Id: I8da6cf4f8bd215e854cd457ac438d020d5edce80
diff --git a/tools/gn2bp/gen_android_bp b/tools/gn2bp/gen_android_bp
index 46918c6..499b6e3 100755
--- a/tools/gn2bp/gen_android_bp
+++ b/tools/gn2bp/gen_android_bp
@@ -663,7 +663,7 @@
   # It seems this is because cc object is a module with per-architecture variants and genrule is a
   # module with default variant. For 64bit target, cc_object is built multiple times for 32/64bit
   # modes and genrule doesn't know which one to depend on.
-  preprocess_module.compile_multilib = 32
+  preprocess_module.compile_multilib = 'first'
   blueprint.add_module(preprocess_module)
 
   # Generates srcjar using soong_zip