offb: Fix compile error on ppc32 systems

The code Ben H added needs <linux/pci.h> for things like pci_dev, etc.

Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/drivers/video/offb.c b/drivers/video/offb.c
index fe8ba36..00d87f5 100644
--- a/drivers/video/offb.c
+++ b/drivers/video/offb.c
@@ -26,6 +26,7 @@
 #include <linux/fb.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
+#include <linux/pci.h>
 #include <asm/io.h>
 #include <asm/prom.h>