There is no problem for you to recite the prayer call in your way to the mosque in order to inform people about prayer time because the Prophet had two prayer calls for Fajr. This is a righteous deed and I hope Allah will reward you for. It is not an act of innovation simply because the Prophet awaked people for Fajr in many occasions.

 

`A’ishah (May Allah be pleased with her) reported: The Prophet (peace be upon him) used to perform his voluntary prayer at night (i.e., Tahajjud prayer) while she was sleeping in front of him; and when the Witr prayer was yet to be observed, he would awaken her to perform her Witr prayer. (Muslim)