sandbox: add tests for UCLASS_SM

This patchs adds simple tests for Secure Monitor uclass.

Signed-off-by: Alexey Romanov <avromanov@salutedevices.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Link: https://lore.kernel.org/r/20230921081346.22157-5-avromanov@salutedevices.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
diff --git a/test/dm/Makefile b/test/dm/Makefile
index 7ed0073..02c651a 100644
--- a/test/dm/Makefile
+++ b/test/dm/Makefile
@@ -115,6 +115,7 @@
 obj-$(CONFIG_SPMI) += spmi.o
 obj-y += syscon.o
 obj-$(CONFIG_RESET_SYSCON) += syscon-reset.o
+obj-$(CONFIG_SM) += sm.o
 obj-$(CONFIG_SYSINFO) += sysinfo.o
 obj-$(CONFIG_SYSINFO_GPIO) += sysinfo-gpio.o
 obj-$(CONFIG_UT_DM) += tag.o