[Spec] Occupancy Sensing cluster datamodel (XML) use anonymoous bitmap and enum types in attributes

[jsloth]

The data-model (XML) for Occupancy Sensing use anonymous BITMAP and ENUM types in attributes:

connectedhomeip/src/app/zap-templates/zcl/data-model/silabs/ha.xml

Lines 398 to 400 in cb430db

	<attribute side="server" code="0x0000" define="OCCUPANCY" type="BITMAP8" min="0x00" max="0x01" writable="false" reportable="true" optional="false">occupancy</attribute>
	<attribute side="server" code="0x0001" define="OCCUPANCY_SENSOR_TYPE" type="ENUM8" min="0x00" max="0xFE" writable="false" optional="false">occupancy sensor type</attribute>
	<attribute side="server" code="0x0002" define="OCCUPANCY_SENSOR_TYPE_BITMAP" type="BITMAP8" min="0x00" max="0x07" writable="false" optional="false">occupancy sensor type bitmap</attribute>

Should use following types instead:

connectedhomeip/src/app/zap-templates/zcl/data-model/silabs/types.xml

Line 66 in cb430db

<bitmap name="Occupancy" type="BITMAP8">

connectedhomeip/src/app/zap-templates/zcl/data-model/silabs/types.xml

Line 253 in cb430db

<enum name="OccupancySensorType" type="ENUM8">

connectedhomeip/src/app/zap-templates/zcl/data-model/silabs/types.xml

Line 259 in cb430db

<bitmap name="OccupancySensorTypeBitmap" type="BITMAP8">

This issue is similar to #24075 and #23656

[bzbarsky-apple]

This needs to be fixed in the spec, then the fix can be followed in the SDK. That way the names will get feedback before being shipped as API to consumers.

[bzbarsky-apple]

@jsloth Please raise spec issues as needed.