staging: vc04_services: vchiq: Drop custom return values from TODO

The custom return values (enum vchiq_status) has been dropped.
Remove the TODO entry for the same.
Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/20221223122404.170585-8-umang.jain@ideasonboard.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/interface/TODO

@@ -40,11 +40,6 @@ beneficial to go over all of them and, if correct, comment on their merits.
 Extra points to whomever confidently reviews the remote_event_*() family of
 functions.
 
-* Get rid of custom function return values
-
-Most functions use a custom set of return values, we should force proper Linux
-error numbers. Special care is needed for VCHIQ_RETRY.
-
 * Reformat core code with more sane indentations
 
 The code follows the 80 characters limitation yet tends to go 3 or 4 levels of