net: fix driver build errors due to missing net/ip6_checksum.h include

net: fix driver build errors due to missing net/ip6_checksum.h include

  2.6.27-git2 kernel build fails with allyesconfig on powerpc with
build error

<introduced by commit 73c23f226610d8db3bb9cb3ad37e914f6dc01a30>

CC    drivers/net/enic/enic_main.o
drivers/net/enic/enic_main.c: In function â\80\98enic_queue_wq_skb_tsoâ\80\99:
drivers/net/enic/enic_main.c:576: error: implicit declaration of function â\80\98csum_ipv6_magicâ\80\99
make[3]: *** [drivers/net/enic/enic_main.o] Error 1

<introduced by commit 63ece9a89de6a1f112b84e4b2f928e19d0d434a6>

drivers/net/qlge/qlge_main.c: In function â\80\98ql_tsoâ\80\99:
drivers/net/qlge/qlge_main.c:1862: error: implicit declaration of function â\80\98csum_ipv6_magicâ\80\99
make[3]: *** [drivers/net/qlge/qlge_main.o] Error 1

<introduced by commit 8ed7ee2c9590e5a3083d2dd9373b7a6ef32b4d1f>

drivers/net/jme.c: In function â\80\98jme_tx_tsoâ\80\99:
drivers/net/jme.c:1784: error: implicit declaration of function â\80\98csum_ipv6_magicâ\80\99
make[2]: *** [drivers/net/jme.o] Error 1

Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Ron Mercer <ron.mercer@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>