dt-bindings: clockgen: Add compatible string for LS1088A

Signed-off-by: Harninder Rai <harninder.rai@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/clock/qoriq-clock.txt

@@ -35,6 +35,7 @@ Required properties:
 	* "fsl,ls1021a-clockgen"
 	* "fsl,ls1043a-clockgen"
 	* "fsl,ls1046a-clockgen"
+	* "fsl,ls1088a-clockgen"
 	* "fsl,ls2080a-clockgen"
 	Chassis-version clock strings include:
 	* "fsl,qoriq-clockgen-1.0": for chassis 1.0 clocks