SUNRPC: sunrpc should not explicitly depend on NFS config options

Change explicit references to CONFIG_NFS_V4_1 to implicit ones
Get rid of the unnecessary defines in backchannel_rqst.c and
bc_svc.c: the Makefile takes care of those dependency.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --cc fs/nfs/Kconfig
Simple merge

diff --cc include/linux/sunrpc/bc_xprt.h
Simple merge

diff --cc include/linux/sunrpc/svc.h
Simple merge

diff --cc include/linux/sunrpc/xprt.h
Simple merge

diff --cc net/sunrpc/Kconfig
Simple merge

diff --cc net/sunrpc/Makefile
Simple merge

diff --cc net/sunrpc/backchannel_rqst.c
Simple merge

diff --cc net/sunrpc/bc_svc.c
Simple merge

diff --cc net/sunrpc/clnt.c
Simple merge

diff --cc net/sunrpc/svc.c
Simple merge

diff --cc net/sunrpc/svcsock.c
Simple merge

diff --cc net/sunrpc/xprt.c
Simple merge

diff --cc net/sunrpc/xprtsock.c
Simple merge