ibm: Add compatible strings for chassis

Add enums for the compatible strings used by entity-manager for the
various chassis types.

Change-Id: Ibea95513a38359b7c378add391afbb77235a4900
Signed-off-by

ibm: Add compatible strings for chassis

Add enums for the compatible strings used by entity-manager for the
various chassis types.

Change-Id: Ibea95513a38359b7c378add391afbb77235a4900
Signed-off-by: Matt Spinler <spinler@us.ibm.com>

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