dt-bindings: vendors: Add VoCore as a vendor

VoCore are a manufacturer of devices such as the VoCore2.
Signed-off-by: NHarvey Hunt <harvey.hunt@imgtec.com>
Acked-by: NRob Herring <robh@kernel.org>
Cc: robh+dt@kernel.org
Cc: mark.rutland@arm.com
Cc: john@phrozen.org
Cc: linux-kernel@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17132/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -353,6 +353,7 @@ variscite	Variscite Ltd.
 via	VIA Technologies, Inc.
 virtio	Virtual I/O Device Specification, developed by the OASIS consortium
 vivante	Vivante Corporation
+vocore VoCore Studio
 voipac	Voipac Technologies s.r.o.
 wd	Western Digital Corp.
 wetek	WeTek Electronics, limited.