configs: meson: remove unnecessary MESON_FDTFILE_SETTING

MESON_FDTFILE_SETTING is used to define the default name of the fdt
file in u-boot environment. We can easily derive it from
CONFIG_DEFAULT_DEVICE_TREE instead. This will help factorize the code
a bit

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/include/configs/meson-gx-common.h b/include/configs/meson-gx-common.h
index c46522e..c436976 100644
--- a/include/configs/meson-gx-common.h
+++ b/include/configs/meson-gx-common.h
@@ -44,7 +44,7 @@
 	"kernel_addr_r=0x01080000\0" \
 	"pxefile_addr_r=0x01080000\0" \
 	"ramdisk_addr_r=0x13000000\0" \
-	MESON_FDTFILE_SETTING \
+	"fdtfile=amlogic/" CONFIG_DEFAULT_DEVICE_TREE ".dtb\0" \
 	BOOTENV
 
 #define CONFIG_SYS_BOOTM_LEN    (64 << 20)      /* 64 MiB */