CDROM: Add timing for speed changes/adjust seek timing

This makes the BIOS take longer to load the executable off the disc,
giving the sound effects longer to fade out and reducing the overlap
with the game.

src/core/save_state_version.h

@@ -2,4 +2,4 @@
 #include "types.h"
 
 static constexpr u32 SAVE_STATE_MAGIC = 0x43435544;
-static constexpr u32 SAVE_STATE_VERSION = 21;
+static constexpr u32 SAVE_STATE_VERSION = 22;