Merge "Updates InputDevice.cpp to read input configs from an APEX."

    // Treblized input device config files will be located /product/usr, /system_ext/usr,

    // /odm/usr or /vendor/usr.

    const char* rootsForPartition[]{"/product", "/system_ext", "/odm", "/vendor",

                                    getenv("ANDROID_ROOT")};

    // These files may also be in the com.android.input.config APEX.

    const char* rootsForPartition[]{

            "/product",

            "/system_ext",

            "/odm",

            "/vendor",

            "/apex/com.android.input.config/etc",

            getenv("ANDROID_ROOT"),

    };

    for (size_t i = 0; i < size(rootsForPartition); i++) {

        if (rootsForPartition[i] == nullptr) {

            continue;