unicore32 machine related files: pci bus handling

This patch implements arch-specific pci bus driver.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 98e6fdf..77cf813 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -42,6 +42,7 @@
 obj-$(CONFIG_X86) += setup-bus.o
 obj-$(CONFIG_ALPHA) += setup-bus.o setup-irq.o
 obj-$(CONFIG_ARM) += setup-bus.o setup-irq.o
+obj-$(CONFIG_UNICORE32) += setup-bus.o setup-irq.o
 obj-$(CONFIG_PARISC) += setup-bus.o
 obj-$(CONFIG_SUPERH) += setup-bus.o setup-irq.o
 obj-$(CONFIG_PPC) += setup-bus.o