powerpc: Move CONFIG_QE_GPIO to SoC

Commit 7aa1aa6ece ("QE: Move QE from arch/powerpc to drivers/soc")
moved QE into drivers/soc including gpio.c but left CONFIG_QE_GPIO
in powerpc's Kconfig.

Move it to SoC as well as it is the only place it is used:

  drivers/soc/fsl/qe/Makefile:obj-$(CONFIG_QE_GPIO)       += gpio.o qe_ports_ic.o
  include/soc/fsl/qe/qe.h:#ifdef CONFIG_QE_GPIO
  include/soc/fsl/qe/qe.h:#endif /* CONFIG_QE_GPIO */

There is also a dependency in USB subsystem for CONFIG_USB_FHCI_HCD:

  drivers/usb/host/Kconfig:	depends on QE_GPIO && QUICC_ENGINE

Because that USB driver selects CONFIG_FSL_GTM which is specific to
powerpc, it has to depend on CONFIG_PPC.

Acked-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://lore.kernel.org/r/9a7131d15a94e2017877e628f0e97f9aa2e0aae9.1785140877.git.chleroy@kernel.org
Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>

arch/powerpc/platforms/Kconfig

@@ -228,14 +228,6 @@ config TAU_AVERAGE
 
 	  If in doubt, say N here.
 
-config QE_GPIO
-	bool "QE GPIO support"
-	depends on QUICC_ENGINE
-	select GPIOLIB
-	help
-	  Say Y here if you're going to use hardware that connects to the
-	  QE GPIOs.
-
 config CPM2
 	bool "Enable support for the CPM2 (Communications Processor Module)"
 	depends on (FSL_SOC_BOOKE && PPC32) || PPC_82xx

drivers/soc/fsl/qe/Kconfig

@@ -67,3 +67,11 @@ config QE_USB
 	default y if USB_FSL_QE
 	help
 	  QE USB Controller support
+
+config QE_GPIO
+	bool "QE GPIO support"
+	depends on QUICC_ENGINE
+	select GPIOLIB
+	help
+	  Say Y here if you're going to use hardware that connects to the
+	  QE GPIOs.

drivers/usb/host/Kconfig

@@ -611,6 +611,7 @@ config USB_UHCI_ASPEED
 config USB_FHCI_HCD
 	tristate "Freescale QE USB Host Controller support"
 	depends on QE_GPIO && QUICC_ENGINE
+	depends on PPC
 	select FSL_GTM
 	select QE_USB
 	help