imx6: use device-tree compatible for board name

In imx6, we currently use the model from DTS to derive a board name
manually in /lib/imx6.sh.

However, if we have individual DTS files anyway, we can exploit
generic 02_sysinfo and use the compatible as board name directly.

While at it, remove the wildcards from /lib/upgrade/platform.sh as
these might make code shorter, but are quite unpleasant when grepping
for a specific device.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/imx6/base-files/lib/preinit/01_sysinfo

@@ -1,7 +0,0 @@
-do_sysinfo_imx6() {
-	. /lib/imx6.sh
-
-	imx6_board_detect
-}
-
-boot_hook_add preinit_main do_sysinfo_imx6

target/linux/imx6/base-files/lib/preinit/79_move_config

@@ -6,7 +6,9 @@ move_config() {
 	local board=$(board_name)
 
 	case "$board" in
-	apalis*)
+	toradex,apalis_imx6q-eval |\
+	toradex,apalis_imx6q-ixora |\
+	toradex,apalis_imx6q-ixora-v1.1 )
 		if [ -b $(bootpart_from_uuid) ]; then
 			apalis_mount_boot
 			[ -f "/boot/$BACKUP_FILE" ] && mv -f "/boot/$BACKUP_FILE" /