getsubopt is not available in android. The "get" option
doesn't really need sub-options, just display all the
current frequency settings (as per discussion with
Ben Widawsky)

Ben v2: Remove the -geff example in the header
Fixed another typo for the --set while there (found by Dave Gordon)

Signed-off-by: Tim Gore <tim.gore@intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>