of: Add vendor prefix for eGalax_eMPIA Technology Inc

eGalax_eMPIA Technology Inc (EETI) is a company specialized in
touchscreen controller solutions.
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -71,6 +71,7 @@ dmo	Data Modul AG
 ea	Embedded Artists AB
 ebv	EBV Elektronik
 edt	Emerging Display Technologies
+eeti	eGalax_eMPIA Technology Inc
 elan	Elan Microelectronic Corp.
 emmicro	EM Microelectronic
 energymicro	Silicon Laboratories (formerly Energy Micro AS)