Add set LNB tone support.

Test:

dvbtune -s dvbs2 -i 1110000 -r 30000 -m psk8 -p h
SPACECAST2# i2cget -y 0 0x60 0
0x9c

dvbtune -s dvbs2 -i 1110000 -r 30000 -m psk8 -p v
SPACECAST2# i2cget -y 0 0x60 0
0x98

dvbtune -s dvbs2 -i 1110000 -r 30000 -m psk8 -p h
SPACECAST2# i2cget -y 0 0x60 0
0x90

dvbtune -s dvbs2 -i 1110000 -r 30000 -m psk8 -t
SPACECAST2# i2cget -y 0 0x60 0
0xb0

Google-Bug-Id: 19432272
Change-Id: Ibbc11ce2de4626e0014263a058557024eb6f9452
4 files changed