[source] ipq806x: remove device specific sysupgrade image checks

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/b5ee86c4e5dd11cb158f34b21e66003190b90981

commit b5ee86c4e5dd11cb158f34b21e66003190b90981
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Sun Nov 20 20:06:15 2016 +0100

    ipq806x: remove device specific sysupgrade image checks
    
    Replaced by image metadata
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 .../ipq806x/base-files/lib/upgrade/platform.sh     | 25 +---------------------
 1 file changed, 1 insertion(+), 24 deletions(-)

diff --git a/target/linux/ipq806x/base-files/lib/upgrade/platform.sh b/target/linux/ipq806x/base-files/lib/upgrade/platform.sh
index db1f4b6..250979d 100644
--- a/target/linux/ipq806x/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ipq806x/base-files/lib/upgrade/platform.sh
@@ -4,30 +4,7 @@ PART_NAME=firmware
 REQUIRE_IMAGE_METADATA=1
 
 platform_check_image() {
-	local board=$(ipq806x_board_name)
-
-	case "$board" in
-	ap148 |\
-	d7800 |\
-	ea8500 |\
-	nbg6817 |\
-	r7500 |\
-	r7500v2 |\
-	r7800)
-		nand_do_platform_check $board $1
-		return $?;
-		;;
-	c2600)
-		local magic_long="$(get_magic_long "$1")"
-		[ "$magic_long" != "27051956" ] && {
-			echo "Invalid image, bad magic: $magic_long"
-			return 1
-		}
-		return 0;
-		;;
-	*)
-		return 1;
-	esac
+	return 0;
 }
 
 platform_pre_upgrade() {