add missing files from 2.1.2 merge

fixes 67c7ce7b79

buildroot/tests/mks_robin_nano_v1v2_usbmod

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+#
+# Build tests for MKS Robin nano V1.2 and V2 with native USB modification
+# (STM32F1 genericSTM32F103VE)
+#
+
+# exit on first failure
+set -e
+
+#
+# MKS/ZNP Robin nano v1.2 with Emulated DOGM FSMC
+#
+use_example_configs Mks/Robin
+opt_add USB_MOD
+opt_set MOTHERBOARD BOARD_MKS_ROBIN_NANO SERIAL_PORT -1
+exec_test $1 $2 "MKS/ZNP Robin nano v1.2 with Emulated DOGM FSMC (native USB mod)" "$3"
+
+# cleanup
+restore_configs