dt-bindings: power: Add BQ27Z561 compatible

Add the Texas Instruments bq27z561 battery monitor to the bq27xxx
binding.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Documentation/devicetree/bindings/power/supply/bq27xxx.yaml

@@ -49,6 +49,7 @@ properties:
       - ti,bq27426
       - ti,bq27441
       - ti,bq27621
+      - ti,bq27z561
 
   reg:
     maxItems: 1