ts5x00: bump to Linux 3.17

The support for the TS-5400 platform is mainlined since Linux 3.17.

This commit removes the outdated support patch and bumps the kernel
headers (and thus Linux) to 3.17.x.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>