Staging: ti-st: update TODO

Removed TODO item 2 :
Current UIM/KIM communicate via the rfkill device and identified by the unique idx
assisgned by the rfkill sub-system to each of these rfkill entries.

Removed TODO item 1 :
Since there is no way we can test existance of multiple connectivity
devices on  platform.
However the basic infrastructure as in providing a context to ST driver
exist.
If multiple devices have to exist on a given platform, multiple ST
platform devices need to be registered and each of the protocol drivers
have to mention which platform device they want to bind to/make use of.

Removed TODO item 3:
Locking have been reviewed and commit
36b5aee4 documents locking.

Signed-off-by: Pavan Savoy <pavan_savoy@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>