dt-bindings: clock: adi,axi-clkgen: add compatible string for ZynqMP support

The axi-clkgen driver now supports ZynqMP (UltraScale) as well, however the
driver needs to use different PFD & VCO limits.

For ZynqMP, these needs to be selected by using the
'adi,zynqmp-axi-clkgen-2.00.a' string.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20210201151245.21845-4-alexandru.ardelean@analog.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Documentation/devicetree/bindings/clock/adi,axi-clkgen.yaml

@@ -20,6 +20,7 @@ properties:
   compatible:
     enum:
       - adi,axi-clkgen-2.00.a
+      - adi,zynqmp-axi-clkgen-2.00.a
 
   clocks:
     description: