SurfaceFlinger: remove DdmConnection

DdmConnection dlopen's libart.so which is undesirable for the Runtime Module.

Bug: 120782499
Test: m -j100
Change-Id: Ib9a129329f7bd8d67b954e58810807c683b20b48
Merged-In: Ib9a129329f7bd8d67b954e58810807c683b20b48
Exempt-From-Owner-Approval: Cherry-pick of approved CL in master