mbim-broadband-modem, qmi-shared: Fallback from qmi uim service only when not supported

When using qmi uim service from mbim broadband modem, a fallback from using qmi uim service to normal mbim operations is done every time a call to qmi_set_primary_sim_slot fails. But this may fall for various reasons, and a fallback only makes sense when the device does not support that call