mei: drop the TODO from samples

The TODO file is not relevant anymore and it's just a leftover from
the time the driver was in the staging tree.
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Reviewed-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

samples/mei/TODO

-TODO:
-	- Cleanup and split the timer function