Previously, filling of F1 Setup Request depended on reading the RRC;
hence, for timing reasons, we only initialized and sent the F1 Setup
Request once the MAC and RRC are ready.

After moving SCC, SCD, MIB, and SIB1 to MAC, the MAC does not depend on
an RRC being present anymore, and hence, the F1 Setup Request does
neither. In this commit, we read the F1 Setup Request after initializing
the MAC.