ad9361 201407xx util.c - careful about mixing with a real Linux environment

The ad9361 util.c includes a function __ffs() which returns the first LSB bit that is set using a 0-base notation.

This function mirrors the BSD function ffs() and the GLIB 2.0 implementation with the symbol __ffs() which returns the first LSB bit that is set using a 1-base notation.

If you end up linking the wrong library, certain code will not work. (Ask me how I know...)

Recommand ADI not use a Linux standard function name for different behavior.