staging: atomisp: Augment TODO file with GPIO work item

To make sure that these drivers do not leave staging before they
are properly converted to use the new GPIO descriptor API,
augment the TODO file with this work item.

Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Acked-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/media/atomisp/TODO

@@ -50,6 +50,11 @@
 
 11. Switch from videobuf1 to videobuf2. Videobuf1 is being removed!
 
+12. Convert all uses of the old GPIO API from <linux/gpio.h> to the
+    GPIO descriptor API in <linux/gpio/consumer.h> and look up GPIO
+    lines from device properties. See other platform drivers for
+    examples.
+
 Limitations:
 
 1. To test the patches, you also need the ISP firmware