Remove OpenSSLSocketImpl counting in dumpMemInfo

This change removes the counting of OpenSSLSocketImpl instances in
ApplicationThread.dumpMemInfo, since it's not necessary for debugging.
This reduces the number of CPU cycles spent in bug reports by ~2.5%.

Bug: 232447124
Test: Build; check simpleperf recordings of bug reports to confirm
      decrease in CPU usage.
Change-Id: I4671bfd27434fcff99bc89ee8431adcb02e7cb54