ARM: dts: imx6-dhcom: Remove fdt_high and initrd_high env variables

Remove both "fdt_high" and "initrd_high" environment variables
in favor of "bootm_size" to safely contain a kernel, device tree
and initrd for relocation inside of 256 MiB region of DRAM.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
diff --git a/include/configs/dh_imx6.h b/include/configs/dh_imx6.h
index 9b6f03f..0935493 100644
--- a/include/configs/dh_imx6.h
+++ b/include/configs/dh_imx6.h
@@ -36,10 +36,9 @@
 #endif
 
 #define CFG_EXTRA_ENV_SETTINGS	\
+	"bootm_size=0x10000000\0"	\
 	"console=ttymxc0,115200\0"	\
 	"fdt_addr=0x18000000\0"		\
-	"fdt_high=0xffffffff\0"		\
-	"initrd_high=0xffffffff\0"	\
 	"kernel_addr_r=0x10008000\0"	\
 	"fdt_addr_r=0x13000000\0"	\
 	"ramdisk_addr_r=0x18000000\0"	\