bindings: vendor-prefixes: add Ai-Thinker Co., Ltd. entry

This commit adds a new vendor prefix for Ai-Thinker Co., Ltd. to the
vendor-prefixes.txt file.

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>

Author: kartben

dts/bindings/vendor-prefixes.txt

@@ -35,6 +35,7 @@ advantech	Advantech Corporation
 aeroflexgaisler	Aeroflex Gaisler AB
 aesc	Aesc Silicon
 aesop	AESOP Embedded Forum
+aithinker	Ai-Thinker Co., Ltd.
 al	Annapurna Labs
 alcatel	Alcatel
 alientek	Alientek