Keep the following targets disabled in mixed build since there are errors in...

Keep the following targets disabled in mixed build since there are errors in mixed_droid CI after go/oag/1861755 is submitted.

func_to_syscall_nrs
libseccomp_policy_app_zygote_sources
libseccomp_policy_app_sources
libseccomp_policy_system_sources

Test: CI
Bug: 204949078

Change-Id: Iaf9d7cd8831da984bcee82399be138ebe3aab9e8