patches: remove redundant VXLAN kernel patches

Upstreamed a long time ago.

Kernel 4.14:
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/net/vxlan.c?id=2673eb2aa39293f08fa5ee60c5775d9ac183cbb2
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/net/vxlan.c?id=951481c52a94ba646e35b99fdb93177ab580555b

Newer kernels:
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/net/vxlan.c?id=a5e74021e84bb5eadf760aaf2c583304f02269be
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/net/vxlan.c?id=0a35dc41fea67ac4495ce7584406bf9557a6e7d0