arm: socfpga: Fix typos in DT files (environmnet -> environment)

Fix a small typo in some of the SoCFPGA dts files that has spread via
copy-and-paste.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Marek Vasut <marex@denx.de>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Chin Liang See <clsee@altera.com>
diff --git a/arch/arm/dts/socfpga_cyclone5_socdk.dts b/arch/arm/dts/socfpga_cyclone5_socdk.dts
index da13435..d4df1a1 100644
--- a/arch/arm/dts/socfpga_cyclone5_socdk.dts
+++ b/arch/arm/dts/socfpga_cyclone5_socdk.dts
@@ -21,7 +21,7 @@
 	};
 
 	aliases {
-		/* this allow the ethaddr uboot environmnet variable contents
+		/* this allow the ethaddr uboot environment variable contents
 		 * to be added to the gmac1 device tree blob.
 		 */
 		ethernet0 = &gmac1;