Embedded: add sercomm stubs
The sercomm functions are unavailable in case of embedded build. Add
stub and link the tests against it.
Change-Id: I9bc5cb2f822b1a3ffdc6ec29f46b6bac8288314e
diff --git a/tests/libsercomstub.c b/tests/libsercomstub.c
new file mode 100644
index 0000000..99662d0
--- /dev/null
+++ b/tests/libsercomstub.c
@@ -0,0 +1,3 @@
+/* Stubs for embedded build */
+void sercomm_drv_lock(unsigned long __attribute__((unused)) *flags) {}
+void sercomm_drv_unlock(unsigned long __attribute__((unused)) *flags) {}