cdvdman: Fix for Samurai Warriors 2 and Warriors Orochi series. (#226)

Some games, such as Warriors Orochi (USA), calls sceCdReadIOPMem()
with a logical IOP RAM address (in this specific game, the passed
pointer is a KSEG0 - a.k.a. Kernel Mode, Segment 0 - logical IOP
RAM address) as its third parameter, which normally is not an issue,
but on slim consoles (SCPH-75000 series and newer), the game crashes
when being run from USB media. Fix this issue by ensuring that the
provided pointer to IOP RAM is a physical address.

Note that a similar measure is applied in cdvd_readee() (see cdvdfsv.c line 807):

http://github.com/ifcaro/Open-PS2-Loader/blob/master/modules/iopcore/cdvdfsv/cdvdfsv.c#L807

As a side note, this fix should apply for related koei games (Warriors
Orochi 2 and Samurai Warriors 2 series), as those games do the same
thing as Warriors Orochi regarding sceCdReadIOPMem().

modules/iopcore/cdvdman/cdvdman.c

@@ -31,6 +31,8 @@
 #include <usbd.h>
 #include "ioman_add.h"
 
+#include <defs.h>
+
 #define MODNAME "cdvd_driver"
 IRX_ID(MODNAME, 1, 1);
 
@@ -421,6 +423,7 @@ static int cdvdman_read(u32 lsn, u32 sectors, void *buf)
 {
     cdvdman_stat.status = CDVD_STAT_READ;
 
+    buf = (void *)PHYSADDR(buf);
 #ifdef HDD_DRIVER //As of now, only the ATA interface requires this. We do this here to share cdvdman_buf.
     if ((u32)(buf)&3) {
         //For transfers to unaligned buffers, a double-copy is required to avoid stalling the device's DMA channel.