Remove unused data variable in ads124x_state struct

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
Move vref-mv to dts

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
Cleanup.  Remove test functions and tracing code.

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
Remove call to wait_for_drdy before conversion

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
Use a smaller value for msleep in the wait_for_drdy busy loop

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
Use a step=2 in ads124x_init_chan_array instead of checing if the current index is even

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
Remove duplicate assignment to chan->info_mask_separate

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
Remove ads124x_write_raw_get_fmt, as it is not clear what it really is supposed to return

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
Reorganize ads124x_probe a little bit

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>