dt-bindings: Add vendor prefix for Allo.com

ALLO is a Canadian-Indian manufacturer of telecommunications hardware.

Cc: Ioan B. <ioan@allo.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Sudeep Kumar <sudeepkumar@cem-solutions.net>
Signed-off-by: Andreas Färber <afaerber@suse.de>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -15,6 +15,7 @@ adi	Analog Devices, Inc.
 advantech	Advantech Corporation
 aeroflexgaisler	Aeroflex Gaisler AB
 al	Annapurna Labs
+allo	Allo.com
 allwinner	Allwinner Technology Co., Ltd.
 alphascale	AlphaScale Integrated Circuits Systems, Inc.
 altr	Altera Corp.