Allow drivers to be built with COMPILE_TEST.
Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Link: https://lore.kernel.org/r/5a95c3de07ef020a4e2f2776fa5adb00637ee387.1581324976.git.baolin.wang7@gmail.comSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>