[source] lantiq: remove device specific sysupgrade image checks

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/16adf49620e327feefd9c4087ea175f0759e4258

commit 16adf49620e327feefd9c4087ea175f0759e4258
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Sun Nov 20 20:07:18 2016 +0100

    lantiq: remove device specific sysupgrade image checks
    
    Replaced by image metadata
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 .../lantiq/base-files/lib/upgrade/platform.sh      | 23 +---------------------
 1 file changed, 1 insertion(+), 22 deletions(-)

diff --git a/target/linux/lantiq/base-files/lib/upgrade/platform.sh b/target/linux/lantiq/base-files/lib/upgrade/platform.sh
index 75a41c9..d4db8d2 100755
--- a/target/linux/lantiq/base-files/lib/upgrade/platform.sh
+++ b/target/linux/lantiq/base-files/lib/upgrade/platform.sh
@@ -4,28 +4,7 @@ PART_NAME=firmware
 REQUIRE_IMAGE_METADATA=1
 
 platform_check_image() {
-	[ "$#" -gt 1 ] && return 1
-	local board=$(lantiq_board_name)
-
-	case "$board" in
-		BTHOMEHUBV2B|BTHOMEHUBV3A|BTHOMEHUBV5A|P2812HNUF* )
-			nand_do_platform_check $board $1
-			return $?;
-			;;
-	esac
-
-	case "$(get_magic_word "$1")" in
-		# uImage
-		2705) return 0;;
-		# AVM
-		8112) return 0;;
-		# tplink
-		0200) return 0;;
-		*)
-			echo "Invalid image type"
-			return 1
-		;;
-	esac
+	return 0
 }
 
 platform_pre_upgrade() {