[tools/firmware-utils] adds support for Edimax BR-6524N

fixes #12754

Signed-off-by: <rq@akl.lt>

git-svn-id: svn://svn.openwrt.org/openwrt@35019 3c298f89-4303-0410-b956-a3cf2f4a3e73
[ramips]  adds support for Edimax BR-6524N

fixes #12754

Signed-off-by: <rq@akl.lt>

git-svn-id: svn://svn.openwrt.org/openwrt@35020 3c298f89-4303-0410-b956-a3cf2f4a3e73