oxnas: remove superseded sysupgrade image check

Signed-off-by: Daniel Golle <[email protected]>

target/linux/oxnas/base-files/lib/upgrade/platform.sh

@@ -1,16 +1,7 @@
-#
-# Copyright (C) 2014 OpenWrt.org
-#
-
 REQUIRE_IMAGE_METADATA=1
 
 platform_check_image() {
-	local board=$(board_name)
-
-	[ "$ARGC" -gt 1 ] && return 1
-
-	nand_do_platform_check $board $1
-	return $?
+	return 0
 }
 
 platform_do_upgrade() {