Delay startup of p910nd to give devices more time to enumerate
Fixes issue #4752

Tested on mir3g
Signed-off-by: Francesco Molitierno <francyesc0@hotmail.it>

fix Makefile chmod (644)
replace MD5SUM with HASH
add PKG_MIRROR_HASH when PKG_SOURCE_PROTO:=git

(PKG_SOURCE_PROTO:=svn tarballs are not reproducible for now)

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

Signed-off-by: Maximilian Mehnert <maximilian.mehnert@gmx.de>
[pkerling@casix.org: increase PKG_RELEASE version]
Signed-off-by: Philipp Kerling <pkerling@casix.org>

Signed-off-by: Philipp Kerling <pkerling@casix.org>