staging: bcm2835-camera: Update TODO

Remove the TODO item to remove manual cache flushing from bulk_receive.
This was previously done in this commit:

commit 7e8dbea4 ("staging: bcm2835-camera: Remove explicit cache
flush operations")
Signed-off-by: Aymen Qader <qader.aymen@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/bcm2835-camera/TODO

@@ -15,9 +15,3 @@ padding in the V4L2 spec, but that padding doesn't match what the
 hardware can do.  If we exposed the native padding requirements
 through the V4L2 "multiplanar" formats, the firmware would have one
 less copy it needed to do.
-
-3) Port to ARM64
-
-The bulk_receive() does some manual cache flushing that are 32-bit ARM
-only, which we should convert to proper cross-platform APIs.
-