Antminers using the stock bootloader will not hash without this GPIO set.
Applies to DD and CC
Signed-off-by: L. D. Pinney <ldpinney@gmail.com>
Backport of r47261
git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@47267 3c298f89-4303-0410-b956-a3cf2f4a3e73