V4L/DVB: dvb: fix sparse warnings

Fix sparse warnings in media/dvb/frontends:

drivers/media/dvb/frontends/dibx000_common.c:177:13: warning: non-ANSI function declaration of function 'systime'
drivers/media/dvb/frontends/tda665x.c:136:55: warning: right shift by bigger than source value

[mchehab@redhat.com: removed the change at dib0090 since it got fixed by a previous patch]
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>