broadcom-diag: add gpio config for Linksys E4200v1

GPIO for Linksys E4200v1, tested and works. This closes #13454 and #13894

Signed-off-by: Cezary Jackiewicz <cezary.jackiewicz@gmail.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>


git-svn-id: svn://svn.openwrt.org/openwrt@37666 3c298f89-4303-0410-b956-a3cf2f4a3e73
broadcom-diag: add gpio config for Asus RT-N66U

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>


git-svn-id: svn://svn.openwrt.org/openwrt@37667 3c298f89-4303-0410-b956-a3cf2f4a3e73
broadcom-diag: show error message in case something goes wrong with gpio irq

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>


git-svn-id: svn://svn.openwrt.org/openwrt@37668 3c298f89-4303-0410-b956-a3cf2f4a3e73