Add test_timer_blocking command to smoke test.

This command ensures the TimerService is functioning correctly.

Change-Id: Ibc871f118a620d4d84313f0873b5083912518d34

shodan_boot.robot

diff --git a/shodan_boot.robot b/shodan_boot.robot
index 0d43c22..15c31f7 100644
--- a/shodan_boot.robot
+++ b/shodan_boot.robot
@@ -42,3 +42,5 @@
     Write Line to Uart          test_mlexecute fubar mobilenet_v1_emitc_static.model  testerId=${sel4uart}
     Wait For Prompt On Uart     ${PROMPT}                                             testerId=${sel4uart}
     Wait For LogEntry           "main returned: ", 0
+    Write Line To Uart          test_timer_blocking 10      testerId=${sel4uart}
+    Wait For LogEntry           Timer completed.