Remove Function,ssi_waketest in omap_ssi.c

Greetings Sebastian and the other maintainers,
I am assuming I can remove the function,ssi_waketest in the file,omap_ssi.c However please let me known if removing this
function breaks any omap boards supported by this driver file that you know of. In addition i would recommend testing 
my patch on a board supported by this file and unfortunately I don't have one lying around my house :(. So it would be
a huge favour if someone can test this out on a omap board supported by drivers in this file and send it with a tested
by with that maintainers name.
Thanks,
Nick