kernel: modules: gpio.mk: renamed from gpio-cascade.mk

This can be used to place the gpio module, so rename it.

Signed-off-by: Chukun Pan <[email protected]>

package/kernel/linux/modules/gpio-cascade.mk → package/kernel/linux/modules/gpio.mk

@@ -2,10 +2,10 @@
 # See /LICENSE for more information.
 #
 
-MENU_TITLE:=GPIO support
+GPIO_MENU:=GPIO support
 
 define KernelPackage/gpio-cascade
-  SUBMENU:=$(MENU_TITLE)
+  SUBMENU:=$(GPIO_MENU)
   TITLE:=Generic GPIO cascade
   KCONFIG:=CONFIG_GPIO_CASCADE
   DEPENDS:=@GPIO_SUPPORT +kmod-mux-core