gpio: Add Generic regmap GPIO conversion to the TODO list

It's actually preferable to use Generic regmap GPIO over other
simple approaches. Add a TODO item for that.

Signed-off-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/TODO

···
   this with dry-coding and sending to maintainers to test
 
 
+Generic regmap GPIO
+
+In the very similar way to Generic MMIO GPIO convert the users which can
+take advantage of using regmap over direct IO accessors. Note, even in
+MMIO case the regmap MMIO with gpio-regmap.c is preferable over gpio-mmio.c.
+
+
 GPIOLIB irqchip
 
 The GPIOLIB irqchip is a helper irqchip for "simple cases" that should