gn2bp: Split `gcc_preprocess` actions into genrules

* It's not allowed to run `gcc` from within genrule in Soong. So It was an easier decision to create a cc_object and run it with a -E flag which is equivalent to what `gcc_preprocess` action does. Then perform a soong_zip on the result to generate the equivalent java file needed

Test: update_results && m cronet_aml_components_cronet_android_cronet
Change-Id: I1b2e50f1f95fbf700c1190902c716e624805a2b4
2 files changed