Remove including <linux/version.h> that don't need it.

V1->V2: Split the patch in two
Signed-off-by: NCai Huoqing <caihuoqing@baidu.com>
Acked-by: NRandy Dunlap <rdunlap@infradead.org>
Signed-off-by: NThierry Reding <treding@nvidia.com>