CMake: greentea: Add skip reason to ticker test

Author: LDong-Arm

drivers/tests/TESTS/mbed_drivers/ticker/CMakeLists.txt

@@ -3,11 +3,17 @@
 
 include(mbed_greentea)
 
+if(NOT "DEVICE_USTICKER=1" IN_LIST MBED_TARGET_DEFINITIONS)
+    set(TEST_SKIPPED "Microsecond ticker required")
+endif()
+
 mbed_greentea_add_test(
     TEST_NAME
         mbed-drivers-ticker
     TEST_SOURCES
         main.cpp
     HOST_TESTS_DIR
         "${CMAKE_CURRENT_LIST_DIR}/../../host_tests"
+    TEST_SKIPPED
+        ${TEST_SKIPPED}
 )