net: sh_eth: fix build failure

net: sh_eth: fix build failure

The following commit removed some including headers:
 "net: sh_eth: move the asm/sh_eth.h to include/linux/"
 (commit id: d4fa0e35fdbd54acf791fa3793d6d17f7795f7ae)

Then, the build failure happened on the linux-next:

drivers/net/ethernet/renesas/sh_eth.c:601: error: 'THIS_MODULE' undeclared here (not in a function)
drivers/net/ethernet/renesas/sh_eth.c:1970: error: expected declaration specifiers or '...' before string constant
drivers/net/ethernet/renesas/sh_eth.c:1970: warning: data definition has no type or storage class
drivers/net/ethernet/renesas/sh_eth.c:1970: warning: type defaults to 'int' in declaration of 'MODULE_AUTHOR'
drivers/net/ethernet/renesas/sh_eth.c:1970: warning: function declaration isn't a prototype
drivers/net/ethernet/renesas/sh_eth.c:1971: error: expected declaration specifiers or '...' before string constant
drivers/net/ethernet/renesas/sh_eth.c:1971: warning: data definition has no type or storage class
drivers/net/ethernet/renesas/sh_eth.c:1971: warning: type defaults to 'int' in declaration of 'MODULE_DESCRIPTION'
drivers/net/ethernet/renesas/sh_eth.c:1971: warning: function declaration isn't a prototype
drivers/net/ethernet/renesas/sh_eth.c:1972: error: expected declaration specifiers or '...' before string constant
drivers/net/ethernet/renesas/sh_eth.c:1972: warning: data definition has no type or storage class
drivers/net/ethernet/renesas/sh_eth.c:1972: warning: type defaults to 'int' in declaration of 'MODULE_LICENSE'
drivers/net/ethernet/renesas/sh_eth.c:1972: warning: function declaration isn't a prototype

This patch fixes the issue. This patch also get back include/kernel.h
and linux/spinlock.h.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>