MIPS: force CONFIG_PCI to on for IP27 and IP30

These are PCI based systems, so not enabling the support is rather
pointless.  Additionally the random configѕ generated by the build bot
for IP27 and IP30 builds without PCI fail to buіld.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/Kconfig

@@ -713,6 +713,7 @@ config SGI_IP27
 	select ARC_CMDLINE_ONLY
 	select BOOT_ELF64
 	select DEFAULT_SGI_PARTITION
+	select FORCE_PCI
 	select SYS_HAS_EARLY_PRINTK
 	select HAVE_PCI
 	select IRQ_MIPS_CPU
@@ -775,6 +776,7 @@ config SGI_IP30
 	select BOOT_ELF64
 	select CEVT_R4K
 	select CSRC_R4K
+	select FORCE_PCI
 	select SYNC_R4K if SMP
 	select ZONE_DMA32
 	select HAVE_PCI