Record mainline module info in Mobly Android device info

[ko1in1u]

Example Output:

>>> ad.device_info
{
    'serial': 'XXX',
    'model': 'phone',
    'build_info': {
        'build_id': 'MAIN',
        ...
    },
    'mainline_info': {
        'com.google.android.uwb': '1',
        ...
    },
    'user_added_info': {},
}

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This change is