x86: Consolidate PCI_MMCONFIG configs

Since e279b6c1d329 ("x86: start unification of arch/x86/Kconfig.*"), there
exist two PCI_MMCONFIG entries, one from the original i386 and another from
x86_64. Consolidate both entries into a single one.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: jailhouse-dev@googlegroups.com
Cc: linux-pci@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lkml.kernel.org/r/2a0ccd51ea6f7996e07162918228e23bdc1fbb03.1520408357.git.jan.kiszka@siemens.com

arch/x86/Kconfig

@@ -2640,8 +2640,10 @@ config PCI_DIRECT
 	depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
 
 config PCI_MMCONFIG
-	def_bool y
-	depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
+	bool "Support mmconfig PCI config space access" if X86_64
+	default y
+	depends on PCI && (ACPI || SFI)
+	depends on X86_64 || (PCI_GOANY || PCI_GOMMCONFIG)
 
 config PCI_OLPC
 	def_bool y
@@ -2656,11 +2658,6 @@ config PCI_DOMAINS
 	def_bool y
 	depends on PCI
 
-config PCI_MMCONFIG
-	bool "Support mmconfig PCI config space access"
-	default y
-	depends on X86_64 && PCI && (ACPI || SFI)
-
 config PCI_CNB20LE_QUIRK
 	bool "Read CNB20LE Host Bridge Windows" if EXPERT
 	depends on PCI