of: Add vendor prefix for Toby Churchill Ltd.

Toby Churchill Ltd is a global provider of assistive technology.
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -189,6 +189,7 @@ ste	ST-Ericsson
 stericsson	ST-Ericsson
 synology	Synology, Inc.
 tbs	TBS Technologies
+tcl	Toby Churchill Ltd.
 thine	THine Electronics, Inc.
 ti	Texas Instruments
 tlm	Trusted Logic Mobility