ibm: Add new chassis compatible string

Add the Balcones chassis.

Change-Id: I0fd254fedda3b167fe7ceb30e1ce4bc03a56fc87
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/yaml/com/ibm/Hardware/Chassis.interface.yaml b/yaml/com/ibm/Hardware/Chassis.interface.yaml
index 123c801..6eec20e 100644
--- a/yaml/com/ibm/Hardware/Chassis.interface.yaml
+++ b/yaml/com/ibm/Hardware/Chassis.interface.yaml
@@ -7,6 +7,7 @@
       description: >
           Possible Chassis models used for compatible strings.
       values:
+          - name: Balcones
           - name: BlueRidge
           - name: BlueRidge1S4U
           - name: BlueRidge2U