Updates an existing mobile device extension attribute by name

<mobile_device_extension_attribute>
	<name>Asset Selector</name>
	<description>string</description>
	<date_type>String</date_type>
	<input_type>
		<type>Text Field</type>
	</input_type>
	<inventory_display>General</inventory_display>
</mobile_device_extension_attribute>