of: Add vendor prefix for Energy Micro

The kernel supports devices with the following compatible strings
already:

	energymicro,efm32-i2c
	energymicro,efm32-uart
	energymicro,efm32-spi
	energymicro,efm32-timer

So add "energymicro" to the list of vendors.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index ac7269f..109849b 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -43,6 +43,7 @@
 ebv	EBV Elektronik
 edt	Emerging Display Technologies
 emmicro	EM Microelectronic
+energymicro	Silicon Laboratories (formerly Energy Micro AS)
 epcos	EPCOS AG
 epfl	Ecole Polytechnique Fédérale de Lausanne
 epson	Seiko Epson Corp.