Move SDP related variables out of control block, into separate struct

This is preparation to move SDP performing code to separate file, where
it can be properly unit tested.

As part of this change, some global static buffers, and memory that was
alloced for keeping SDP database is moved to SDP state struct.

Bug: 330675788
Test: mma -j68
Flag: exempt, trivial
Change-Id: I04fb524396eca2613710195cd6521f9720bde40e