PCI: consolidate PCI config entry in drivers/pci

There is no good reason to duplicate the PCI menu in every architecture.
Instead provide a selectable HAVE_PCI symbol that indicates availability
of PCI support, and a FORCE_PCI symbol to for PCI on and the handle the
rest in drivers/pci.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Paul Burton <paul.burton@mips.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arc/Kconfig

@@ -51,9 +51,6 @@ config ARC
 config ARCH_HAS_CACHE_LINE_SIZE
 	def_bool y
 
-config MIGHT_HAVE_PCI
-	bool
-
 config TRACE_IRQFLAGS_SUPPORT
 	def_bool y
 
@@ -553,24 +550,7 @@ config FORCE_MAX_ZONEORDER
 	default "12" if ARC_HUGEPAGE_16M
 	default "11"
 
-menu "Bus Support"
-
-config PCI
-	bool "PCI support" if MIGHT_HAVE_PCI
-	help
-	  PCI is the name of a bus system, i.e., the way the CPU talks to
-	  the other stuff inside your box.  Find out if your board/platform
-	  has PCI.
-
-	  Note: PCIe support for Synopsys Device will be available only
-	  when HAPS DX is configured with PCIe RC bitmap. If you have PCI,
-	  say Y, otherwise N.
-
 config PCI_SYSCALL
 	def_bool PCI
 
-source "drivers/pci/Kconfig"
-
-endmenu
-
 source "kernel/power/Kconfig"

arch/arc/plat-axs10x/Kconfig

@@ -11,7 +11,7 @@ menuconfig ARC_PLAT_AXS10X
 	select DW_APB_ICTL
 	select GPIO_DWAPB
 	select OF_GPIO
-	select MIGHT_HAVE_PCI
+	select HAVE_PCI
 	select GENERIC_IRQ_CHIP
 	select GPIOLIB
 	select AXS101 if ISA_ARCOMPACT

arch/arc/plat-hsdk/Kconfig

@@ -11,4 +11,4 @@ menuconfig ARC_SOC_HSDK
 	select ARC_HAS_ACCL_REGS
 	select CLK_HSDK
 	select RESET_HSDK
-	select MIGHT_HAVE_PCI
+	select HAVE_PCI