staging: nvec: Augment TODO file with GPIO work item

To make sure that this driver does not leave staging before it
is properly converted to use the new GPIO descriptor API,
augment the TODO file with this work item.

Cc: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/nvec/TODO

@@ -4,3 +4,8 @@ ToDo list (incomplete, unordered)
 	- move event handling to nvec_events
 	- finish suspend/resume support
 	- add support for more device implementations
+	- 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
+	  line descriptor from device tree, ACPI or board files
+	- drop the dependency on <linux/of_gpio.h> altogether when migrating
+	  to GPIO descriptors