hwpack: define conf_fdtfile in *.conf

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>

tools/hwpack/mx51evk.conf

@@ -26,3 +26,5 @@ conf_zreladdr="0x90008000"
 conf_loadaddr="0x90010000"
 conf_initrdaddr="0x92000000"
 conf_fdtaddr="0x91ff0000"
+conf_fdtfile="imx51-babbage.dtb"
+need_dtbs=1
\ No newline at end of file

tools/setup_sdcard.sh

@@ -1424,8 +1424,6 @@ check_uboot_type () {
 		SYSTEM="mx51evk"
 		conf_board="mx51evk"
 		is_imx
-		conf_fdtfile="imx51-babbage.dtb"
-		need_dtbs=1
 
 		. "${DIR}"/hwpack/mx51evk.conf
 		convert_uboot_to_dtb_board