of: add mundoreader and radxa vendor prefixes

Add new vendor prefixes for:

    * Mundo Reader S.L., a company that produces tablets and e-readers
    * Radxa, manufacturer of ARM boards
Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -79,6 +79,7 @@ microchip	Microchip Technology Inc.
 mosaixtech	Mosaix Technologies, Inc.
 moxa	Moxa
 mpl	MPL AG
+mundoreader	Mundo Reader S.L.
 mxicy	Macronix International Co., Ltd.
 national	National Semiconductor
 neonode		Neonode Inc.
@@ -98,6 +99,7 @@ powervr	PowerVR (deprecated, use img)
 qca	Qualcomm Atheros, Inc.
 qcom	Qualcomm Technologies, Inc
 qnap	QNAP Systems, Inc.
+radxa	Radxa
 raidsonic	RaidSonic Technology GmbH
 ralink	Mediatek/Ralink Technology Corp.
 ramtron	Ramtron International