sprintf float output support

[laran002]

Problem:
I am having issues with printing floating point output.

This line:
sprintf(dist_str, "dist (%u): %3.2f m\n",frame_seq_nb_rx, (float)(distance));
printk("%s", dist_str);

Outputs this:
dist (0): %3.2f m\n

Possible Solution:
I added CONFIG_FPU=y in prj.conf to enable floating point support.

Action:
If you think this is a valid solution I can generate a pull request to fix it

[mohannad999]

thanks that's work with me

[mrodriguezca]

Another solution is to add CONFIG_CBPRINTF_FP_SUPPORT=y to prj.conf.