Automatically determine presets for known platforms

[jathu]

Summary

For well known platforms, we should automatically infer the preset to choose if the user has not explicitly specified it. Why are am I removing this from CMakePresets.json? Just so we have a single location of mapping from platform → preset file.

If ET is used within other cmake projects, we should be able top automatically pick up the right preset!

Test plan

With this, we can finally just build with just:

$ cmake -S . -B cmake-out
$ cmake --build cmake-out -j $(sysctl -n hw.ncpu)

Presets continue to work:

$ cmake --preset ios
$ cmake --build cmake-out -j $(sysctl -n hw.ncpu)

cc @larryliu0820

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11461

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❌ 39 New Failures

As of commit 26dcee7 with merge base a7a9130 ():

NEW FAILURES - The following jobs have failed:

• Build macOS Wheels / pytorch/executorch / build-wheel-py3_10-cpu (gh)
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