You're question indicates a lack of knowledge about SSRS. An RDLC file is simply the file generated by the report designer with the database connections removed. Therefore a stored proc is not valid. You need to get the data in your code and serve it to the report as a datasource.
RDLC is used as an embedded report whereas RDL is a server based report that may contain links to the database.
I suggest doing a lot more reading and working through the
examples[
^] available