This patch updates "soft_ver" for TP-Link Archer C6 v2 (EU).

It makes possible to upload OpenWrt on lastest vendor's firmware
as the web-based updater checks for major.minor version during upload.

Due to that on next major/minor version update TP-Link will stop
us from using the web-based firmware update tool, so it will
require a new patch on soft_ver to match major and minor version.
Up to today's latest stock firmware the patch (major.minor.patch)
version does not matters, that allows downgrade from 1.1.4 to 1.1.1
but do not allow downgrade from 1.1.X to 1.0.X.

Signed-off-by: Anderson Vulczak <andi@andi.com.br>
(cherry picked from commit 7a8bfbf0)
(cherry picked from commit eeb93e5c2b23518e372737ecf8fdde4b9f139a49)