arm64: Replace fdt_name env variables with fdtfile

The commonly defined environment variable to determine the device tree
file name is called fdtfile rather than fdt_name. Replace all occurences
of fdt_name with fdtfile.

Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/include/configs/hikey.h b/include/configs/hikey.h
index 2c89bd9..0851626 100644
--- a/include/configs/hikey.h
+++ b/include/configs/hikey.h
@@ -118,7 +118,7 @@
 #define CONFIG_EXTRA_ENV_SETTINGS	\
 				"kernel_name=Image\0"	\
 				"kernel_addr_r=0x00080000\0" \
-				"fdt_name=hi6220-hikey.dtb\0" \
+				"fdtfile=hi6220-hikey.dtb\0" \
 				"fdt_addr_r=0x02000000\0" \
 				"fdt_high=0xffffffffffffffff\0" \
 				"initrd_high=0xffffffffffffffff\0" \