Remove config_setting references to --ios_cpu.
Remove config_setting references to --ios_cpu.

GOOGLE: See go/removing-ios-cpu for details.

Tested:
    TAP found no affected targets
    http://test/OCL:161704466:BASE:161669855:1499889610958:d34906ab
PiperOrigin-RevId: 161962024

android/android-test,android/android-test,android/android-test,android/android-test,android/android-test