arm: exynos: Remove duplicated "boardname" env setting

Various places in the code set "boardname" env property.  It was used
for booting from ITB images and choosing proper DTB file name.  Instead
of duplicating it, use existing U-Boot wide - "board_name".

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/include/configs/odroid.h b/include/configs/odroid.h
index b8809c8d..9f2d43e 100644
--- a/include/configs/odroid.h
+++ b/include/configs/odroid.h
@@ -132,7 +132,7 @@
 		"setenv kernelname Image.itb;" \
 		"run loadkernel;" \
 		"run kernel_args;" \
-		"bootm ${kernel_addr_r}#${boardname}\0" \
+		"bootm ${kernel_addr_r}#${board_name}\0" \
 	"boot_uimg=" \
 		"setenv kernelname uImage;" \
 		"run check_dtb;" \