Merge "Add strongbox KM instance as optional" into pi-dev

            <instance>default</instance>

        </interface>

    </hal>

    <hal format="hidl" optional="true">

        <name>android.hardware.keymaster</name>

        <version>4.0</version>

        <interface>

            <name>IKeymasterDevice</name>

            <instance>strongbox</instance>

        </interface>

    </hal>

    <hal format="hidl" optional="true">

        <name>android.hardware.light</name>

        <version>2.0</version>