staging: vc04_services: Remove stack hog issue from TODO

Since there is no vchiq function listed by "make checkstack" anymore,
we can remove the stack hog issue from the TODO.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>