[BE][MPS] Add MPS to clang format (#96562)

I'm getting tired of asking to add space after if and all that jazz, so let's linter do that.
Add section for Objective-C language, where column with is extended to 120 characters and `AlignAfterOpenBracket` is set to `Align`

All `.mm` changes in this PR are made by running linter as follows:
```
lintrunner --take CLANGFORMAT --all-files --apply-patches
```

Pull Request resolved: https://github.com/pytorch/pytorch/pull/96562
Approved by: https://github.com/seemethere, https://github.com/janeyx99, https://github.com/ZainRizvi, https://github.com/izaitsevfb, https://github.com/PaliC, https://github.com/albanD

.clang-format

@@ -60,9 +60,6 @@ MacroBlockBegin: ''
 MacroBlockEnd:   ''
 MaxEmptyLinesToKeep: 1
 NamespaceIndentation: None
-ObjCBlockIndentWidth: 2
-ObjCSpaceAfterProperty: false
-ObjCSpaceBeforeProtocolList: false
 PenaltyBreakBeforeFirstCallParameter: 1
 PenaltyBreakComment: 300
 PenaltyBreakFirstLessLess: 120
@@ -85,4 +82,11 @@ SpacesInSquareBrackets: false
 Standard:        Cpp11
 TabWidth:        8
 UseTab:          Never
+---
+Language: ObjC
+ColumnLimit: 120
+AlignAfterOpenBracket: Align
+ObjCBlockIndentWidth: 2
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: false
 ...