gpio: pmic-eic-sprd: Move Kconfig to MFD expanders

The Spreadtrum PMIC EIC interrupt controller is part of an
MFD expander and should thus be in the MFD GPIO expander
menu section with the rest. Move it.

Cc: Cixi Geng <[e-mail]>
Cc: Baolin Wang <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>
Reviewed-by: Baolin Wang <[e-mail]>
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/Kconfig

···
 	help
 	  Say yes here to support the PrimeCell PL061 GPIO device.
 
-config GPIO_PMIC_EIC_SPRD
-	tristate "Spreadtrum PMIC EIC support"
-	depends on MFD_SC27XX_PMIC || COMPILE_TEST
-	depends on OF_GPIO
-	select GPIOLIB_IRQCHIP
-	help
-	  Say yes here to support Spreadtrum PMIC EIC device.
-
 config GPIO_PXA
 	bool "PXA GPIO support"
 	depends on ARCH_PXA || ARCH_MMP || COMPILE_TEST
···
 	help
 	  Select this option to enable GPIO driver for the TI PALMAS
 	  series chip family.
+
+config GPIO_PMIC_EIC_SPRD
+	tristate "Spreadtrum PMIC EIC support"
+	depends on MFD_SC27XX_PMIC || COMPILE_TEST
+	depends on OF_GPIO
+	select GPIOLIB_IRQCHIP
+	help
+	  Say yes here to support Spreadtrum PMIC EIC device.
 
 config GPIO_RC5T583
 	bool "RICOH RC5T583 GPIO"