CIFS: Reduce CONFIG_CIFS_STATS ifdefs

Make cifs_stats code conditional in the header files to avoid ifdefs in the
main code.

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --cc fs/cifs/cifsglob.h
Simple merge

diff --cc fs/cifs/cifssmb.c
Simple merge

diff --cc fs/cifs/file.c
Simple merge

diff --cc fs/cifs/misc.c
Simple merge