gpio: fix GPIO submenu in Kconfig

Commit a86240a37d43 ("gpiolib: enable CONFIG_GPIOLIB_LEGACY even for
!GPIOLIB") accidentally pulled all items from within the GPIOLIB submenu
into the main driver menu. Put them back under the top-level GPIO entry.

Suggested-by: Rob Herring <[e-mail]>
Fixes: a86240a37d43 ("gpiolib: enable CONFIG_GPIOLIB_LEGACY even for !GPIOLIB")
Reported-by: Rob Herring <[e-mail]>
Closes: https://lore.kernel.org/all/[e-mail]/
Reviewed-by: Arnd Bergmann <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/Kconfig

···
 # GPIO infrastructure and drivers
 #
 
+config GPIOLIB_LEGACY
+	def_bool y
+
 menuconfig GPIOLIB
 	bool "GPIO Support"
 	help
···
 	  one or more of the GPIO drivers below.
 
 	  If unsure, say N.
-
-config GPIOLIB_LEGACY
-	def_bool y
 
 if GPIOLIB