use C10_MOBILE/ANDROID/IOS (#15363)

use C10_MOBILE/ANDROID/IOS (#15363)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15363

Didn't define C10_MOBILE in the numa file move diff: D13380559
move CAFFE2_MOBILE/ANDROID/IOS to c10

```
codemod -m -d caffe2 --extensions h,hpp,cc,cpp,mm "CAFFE2_MOBILE" "C10_MOBILE"
codemod -m -d caffe2 --extensions h,hpp,cc,cpp,mm "CAFFE2_ANDROID" "C10_ANDROID"
codemod -m -d caffe2 --extensions h,hpp,cc,cpp,mm "CAFFE2_IOS" "C10_IOS"

```

i-am-not-moving-c2-to-c10

Reviewed By: marcinkwiatkowski

Differential Revision: D13490020

fbshipit-source-id: c4f01cacbefc0f16d5de94155c26c92fd5d780e4