accel/ivpu: Delete the TODO file

The work items listed in the TODO file of this driver file are either
completed or dropped. The file is no more significant according
to the maintainers. Hence removing it from the sources.

Suggested-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Signed-off-by: Deepak R Varma <drv@mailo.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ZTAucrOT69/tQK2o@runicha.com