[MIPS] PCI: Always enable CONFIG_PCI_DOMAINS

The cost is just too low.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -381,7 +381,6 @@ config SGI_IP27
 	select SYS_HAS_EARLY_PRINTK
 	select HW_HAS_PCI
 	select NR_CPUS_DEFAULT_64
-	select PCI_DOMAINS
 	select SYS_HAS_CPU_R10000
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
@@ -513,7 +512,6 @@ config SIBYTE_BIGSUR
 	select BOOT_ELF32
 	select DMA_COHERENT
 	select NR_CPUS_DEFAULT_4
-	select PCI_DOMAINS
 	select SIBYTE_BCM1x80
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_SB1
@@ -1808,6 +1806,7 @@ config HW_HAS_PCI
 config PCI
 	bool "Support for PCI controller"
 	depends on HW_HAS_PCI
+	select PCI_DOMAINS
 	help
 	  Find out whether you have a PCI motherboard. PCI is the name of a
 	  bus system, i.e. the way the CPU talks to the other stuff inside
@@ -1821,7 +1820,6 @@ config PCI
 
 config PCI_DOMAINS
 	bool
-	depends on PCI
 
 source "drivers/pci/Kconfig"
 

include/asm-mips/pci.h

@@ -150,8 +150,6 @@ pcibios_select_root(struct pci_dev *pdev, struct resource *res)
 	return root;
 }
 
-#ifdef CONFIG_PCI_DOMAINS
-
 #define pci_domain_nr(bus) ((struct pci_controller *)(bus)->sysdata)->index
 
 static inline int pci_proc_domain(struct pci_bus *bus)
@@ -160,8 +158,6 @@ static inline int pci_proc_domain(struct pci_bus *bus)
 	return hose->need_domain_info;
 }
 
-#endif /* CONFIG_PCI_DOMAINS */
-
 #endif /* __KERNEL__ */
 
 /* implement the pci_ DMA API in terms of the generic device dma_ one */