[PATCH] make cdu31a work on at least one system

I've got a Sony CDU33A drive with COR334 controller.  The Linux cdu31a
driver was not updated for 2.6 kernel so it does not work.

Here are patches that try to make the driver working with 2.6
kernel:
  - fix the timeout values in header file
  - Make the driver work in 2.6.X
  - Added workaround to fix hard lockups on eject
  - Fixed door locking problem after mounting empty drive
  - Set double-speed drives to double speed by default
  - Removed all readahead things - not needed anymore

It does work on my system. I also know that it's still broken - it uses 
cli(), MODULE_PARM and it's also not very fast (I _never_ reached full
300KB/s with it, but I know that it's possible in Windows) and probably 
many other things (I'm new to Linux kernel) - so I'm waiting for comments.

drivers/cdrom/cdu31a.h

@@ -72,10 +72,10 @@
                                            from drive (in 1/100th's
                                            of seconds). */
  
-#define SONY_JIFFIES_TIMEOUT    1000	/* Maximum number of times the
+#define SONY_JIFFIES_TIMEOUT    (10*HZ)	/* Maximum number of times the
                                            drive will wait/try for an
                                            operation */
-#define SONY_RESET_TIMEOUT      100	/* Maximum number of times the
+#define SONY_RESET_TIMEOUT      HZ	/* Maximum number of times the
                                            drive will wait/try a reset
                                            operation */
 #define SONY_READY_RETRIES      20000   /* How many times to retry a