Network backend: Update the network_read function to handle masks
Network backend: Update the network_read function to handle masks

Channel masks are now sent by the IIO Daemon when the READBUF
command is used.

Signed-off-by: Paul Cercueil <73d292422978d45c9eeef455bb1b24a0db453722@analog.com>

gburca/libiio,analogdevicesinc/libiio,sensarliar/libiio,Sunderfield/libiio,Sunderfield/libiio,sensarliar/libiio,sensarliar/libiio,gburca/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,Sunderfield/libiio,gburca/libiio