gpio: gpio-by-pinctrl: s/used to do/is used to do/

Add missing "is" to the driver's help text ("used to do" has a
completely different meaning).

Fixes: 7671f4949a6c9111 ("gpio: gpio-by-pinctrl: add pinctrl based generic GPIO driver")
Signed-off-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Linus Walleij <[e-mail]>
Link: https://patch.msgid.link/b1ecb[e-mail]
[Bartosz: tweak the help text even more]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/Kconfig

···
 	  create a simple GPIO device based on the pin control interface
 	  without doing anything custom.
 
-	  This driver used to do GPIO over the ARM SCMI protocol.
+	  This driver is used to access GPIOs over the ARM SCMI protocol.
 
 config GPIO_CADENCE
 	tristate "Cadence GPIO support"