PCI: consolidate the PCI_DOMAINS and PCI_DOMAINS_GENERIC config options

Move the definitions to drivers/pci and let the architectures select
them.  Two small differences to before: PCI_DOMAINS_GENERIC now selects
PCI_DOMAINS, cutting down the churn for modern architectures.  As the
only architectured arm did previously also offer PCI_DOMAINS as a user
visible choice in addition to selecting it from the relevant configs,
this is gone now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Paul Burton <paul.burton@mips.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index f17a39f..5c65916 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -41,6 +41,7 @@
 	select HAVE_PCI
 	select MODULES_USE_ELF_RELA if MODULES
 	select THREAD_INFO_IN_TASK
+	select PCI_DOMAINS_GENERIC if PCI
 	select PCI_MSI if PCI
 	select RISCV_TIMER
 	select GENERIC_IRQ_MULTI_HANDLER
@@ -265,12 +266,6 @@
 
 endmenu
 
-config PCI_DOMAINS
-	def_bool PCI
-
-config PCI_DOMAINS_GENERIC
-	def_bool PCI
-
 menu "Power management options"
 
 source kernel/power/Kconfig