unittest: Enable debug info by default

By enabling debugging information it becomes way much simpler
to find the root cause of a failing unit test as we can simply
run it with a debugger.

Signed-off-by: Rubin Gerritsen <rubin.gerritsen@nordicsemi.no>

cmake/modules/unittest.cmake

@@ -121,6 +121,8 @@ target_link_libraries(testbinary PRIVATE
   ${EXTRA_LDFLAGS_AS_LIST}
   )
 
+target_compile_options(test_interface INTERFACE $<TARGET_PROPERTY:compiler,debug>)
+
 if(CONFIG_COVERAGE)
   target_compile_options(test_interface INTERFACE $<TARGET_PROPERTY:compiler,coverage>)