ums/nyx: reinit sd to update cal trimmers for max perf

bdk/usb/usb_gadget_ums.c

@@ -1837,6 +1837,7 @@ int usb_device_gadget_ums(usb_ctxt_t *usbs)
 	// Initialize sdmmc.
 	if (usbs->type == MMC_SD)
 	{
+		sd_end();
 		sd_mount();
 		sd_unmount();
 		ums.lun.sdmmc = &sd_sdmmc;

nyx/nyx_gui/frontend/gui_info.c

@@ -1269,6 +1269,9 @@ static lv_res_t _create_mbox_benchmark(bool sd_bench)
 	if (sd_bench)
 	{
 		storage = &sd_storage;
+
+		// Re-initialize to update trimmers.
+		sd_end();
 		res = !sd_mount();
 	}
 	else