Move top level pc80 directory to drivers/

There is no reason for this to be a top level directory.
Some stuff from lib/ should also be moved to drivers/

Change-Id: I3c2d2e127f7215eadead029cfc7442c22b26814a
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/939
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/cpu/amd/sc520/raminit.c

@@ -234,7 +234,7 @@ dummy_write(void){
   *ptr = 0;
 }
 
-#include "pc80/udelay_io.c"
+#include "drivers/pc80/udelay_io.c"
 
 static void dumpram(void){
   print_err("ctl "); print_err_hex8(*drcctl); print_err("\n");