Call xf86OpenConsole() before probing for drivers.

On OpenBSD, we need the console fd to query wsdisplay type,
This was only causing problems with -keepPriv, since the privilege
separation code already calls xf86OpenConsole() earlier.
The function is idempotent, so there's no harm calling it
several times.
ok kettenis@

xserver/hw/xfree86/os-support/bus/bsd_pci.c

@@ -51,5 +51,6 @@
 void
 osPciInit(void)
 {
+    xf86OpenConsole();
     xf86InitVidMem();
 }