fmcomm5_phase_sync calls to iii_channel_xxxx missing channel mask

[w1ebr]

The iio.h file shows the iii_channel_enable, iii_channel_disable, etc. should be passed two arguments, the channel and a channel mask. "fmcomm5_phase_sync.c" calls the routines without a channel mask.

[ekigwana]

libiio in undergoing and API update. Ensure that you are using the https://github.com/analogdevicesinc/libiio/tree/libiio-v0 until that is all settled.

See #99