dt-bindings: Drop entry for Monolithic Power System, MPS

This reverts commit 9399e5dc adding the entry, Rob has
rescinded his ack.
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -605,8 +605,6 @@ patternProperties:
     description: MiraMEMS Sensing Technology Co., Ltd.
   "^mitsubishi,.*":
     description: Mitsubishi Electric Corporation
-  "^mps,.*":
-    description: Monolithic Power Systems, Inc.
   "^mosaixtech,.*":
     description: Mosaix Technologies, Inc.
   "^motorola,.*":