GD32F4: Disable sync mode for now

lib/ZuluSCSI_platform_GD32F450/ZuluSCSI_platform.h

@@ -17,7 +17,7 @@ extern const char *g_azplatform_name;
 #if defined(ZULUSCSI_V1_4)
 #   define PLATFORM_NAME "ZuluSCSI v1.4"
 #   define PLATFORM_REVISION "1.4"
-#   define PLATFORM_MAX_SCSI_SPEED S2S_CFG_SPEED_SYNC_10
+// #   define PLATFORM_MAX_SCSI_SPEED S2S_CFG_SPEED_SYNC_10 // FIXME: Sync mode not working yet
 #   define PLATFORM_OPTIMAL_MIN_SD_WRITE_SIZE 4096
 #   define PLATFORM_OPTIMAL_MAX_SD_WRITE_SIZE 65536
 #   define PLATFORM_OPTIMAL_LAST_SD_WRITE_SIZE 8192