kernel: remove xor patch

The xor-min-byte-count.patch was introduced for kernel 3.4 and fixes a network
error HYP-5501. The error can not reproduced with kernel version 3.10.
Therfore, remove xor-min-byte-count.patch.

Signed-off-by: Mario Schuknecht <mario.schuknecht@dresearch-fe.de>