dt-bindings: cache: ax45mp: add 2048 as a supported cache-sets value

The QiLai implementation of this cache controller uses a cache-sets of
2048, and mandates it in an if/else block - but the definition of the
property only permits 1024. Add 2048 as an option, and deny its use
outside of the QiLai.

Fixes: 51b081cdb9237 ("dt-bindings: cache: add QiLai compatible to ax45mp")
Reviewed-by: Ben Zong-You Xie <[e-mail]>
Signed-off-by: Conor Dooley <[e-mail]>

Documentation/devicetree/bindings/cache/andestech,ax45mp-cache.yaml

···
     const: 2
 
   cache-sets:
-    const: 1024
+    enum: [1024, 2048]
 
   cache-size:
     enum: [131072, 262144, 524288, 1048576, 2097152]
···
           const: 2048
         cache-size:
           const: 2097152
+    else:
+      properties:
+        cache-sets:
+          const: 1024
 
 examples:
   - |