package/connman: fix compilation error for kernels >= 4.15

Include the upstream fix 0001-tethering-Reorder-header-includes.patch

Fixes
http://autobuild.buildroot.net/results/90005b436e25495a1113966112785278dfc0420a
http://autobuild.buildroot.net/results/ab713048093746576734e90290b8777222d70e7e
http://autobuild.buildroot.net/results/368c2c8ab9b8db7f445a9681082ce1e10c7e0151
http://autobuild.buildroot.net/results/1c98fd9ce430463e720212ce8a3698e2b72cbe7d
http://autobuild.buildroot.net/results/bc865093e6ffec4737433c5a213c0241495e9ccc
http://autobuild.buildroot.net/results/e4d93b136ef8aff600264d743191bf087044c27a
http://autobuild.buildroot.net/results/a2feeeed4d0d11fda5f029f8c784ed6ce16ee856



Signed-off-by: Martin Bark <martin@barkynet.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>