gpio: fix GPIO submenu in Kconfig

Commit a86240a ("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 <robh@kernel.org>
Fixes: a86240a ("gpiolib: enable CONFIG_GPIOLIB_LEGACY even for !GPIOLIB")
Reported-by: Rob Herring <robh@kernel.org>
Closes: https://lore.kernel.org/all/20250813222649.GA965895-robh@kernel.org/
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20250901125513.108691-1-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Author: Bartosz Golaszewski

drivers/gpio/Kconfig

@@ -3,6 +3,9 @@
 # GPIO infrastructure and drivers
 #
 
+config GPIOLIB_LEGACY
+	def_bool y
+
 menuconfig GPIOLIB
 	bool "GPIO Support"
 	help
@@ -12,9 +15,6 @@ menuconfig GPIOLIB
 
 	  If unsure, say N.
 
-config GPIOLIB_LEGACY
-	def_bool y
-
 if GPIOLIB
 
 config GPIOLIB_FASTPATH_LIMIT