Make the range of exposure values (0-0x1770) distribute evenly through
HV7131R's exposure control bytes.
Signed-off-by: NGerman Galkin <galkinga@gmail.com>
Signed-off-by: NJean-François Moine <moinejf@free.fr>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>