remove unused struct members of 'struct sgsn_pdp_ctx'

There were some members that we neither set nor read, so let's
shrink the struct size and remove those unused members.

Change-Id: I02136e3aa91e58b2afc923c09c8693095497fdd7
1 file changed
tree: d3b223a8ca71556a4b38fcbdefccd7c59f2c08c9
  1. contrib/
  2. debian/
  3. openbsc/
  4. .gitignore
  5. .gitreview
  6. .mailmap