mtd: disable trx_check() for ar71xx, fixes a regression introduced in r42403

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42405 3c298f89-4303-0410-b956-a3cf2f4a3e73
mdns: update to latest git head

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42407 3c298f89-4303-0410-b956-a3cf2f4a3e73