platform/x86/intel/sdsi: Change mailbox timeout

On some platforms, it may take up to 400ms for the ready bit to be set in a
successful mailbox transaction. Set the timeout to 500ms to cover the worst
case.
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230413013230.1521584-1-david.e.box@linux.intel.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/intel/sdsi.c

@@ -49,7 +49,7 @@
 #define SDSI_MBOX_CMD_SUCCESS		0x40
 #define SDSI_MBOX_CMD_TIMEOUT		0x80
 
-#define MBOX_TIMEOUT_US			2000
+#define MBOX_TIMEOUT_US			500000
 #define MBOX_TIMEOUT_ACQUIRE_US		1000
 #define MBOX_POLLING_PERIOD_US		100
 #define MBOX_ACQUIRE_NUM_RETRIES	5