gn2bp: Make update_results parse desc_arm64.json

lunch aosp_arm64 && m cronet_aml_components_cronet_android_cronet is
failing. Will be fixed by upcoming CL.

Test: lunch aosp_arm && m cronet_aml_components_cronet_android_cronet
Test: lunch aosp_cf_x86_phone && m cronet_aml_components_cronet_android_cronet
Test: lunch aosp_cf_x86_64_phone && m cronet_aml_components_cronet_android_cronet
Change-Id: Ibaf4720eaca21d530a31d83ba0173bbc7c9bf302
2 files changed