soc: qcom: rmtfs: allow building the module with COMPILE_TEST=y

Make it possible to build the module when COMPILE_TEST is enabled for
better build coverage.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20241202094903.18388-1-brgl@bgdev.pl


Signed-off-by: Bjorn Andersson <andersson@kernel.org>