dt-bindings: Add vendor prefix for Amarula Solutions

Added 'amarula' as a vendor prefix for Amarula Solutions,
specialist in Embedded and Opensource solutions.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -18,6 +18,7 @@ al	Annapurna Labs
 allwinner	Allwinner Technology Co., Ltd.
 alphascale	AlphaScale Integrated Circuits Systems, Inc.
 altr	Altera Corp.
+amarula	Amarula Solutions
 amazon	Amazon.com, Inc.
 amcc	Applied Micro Circuits Corporation (APM, formally AMCC)
 amd	Advanced Micro Devices (AMD), Inc.