V4L/DVB (3988): Add math routines required by DVB demods

Signed-off-by: Christoph Pfister <christophpfister@bluemail.ch>
Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
3 files changed