Revert "Include com.android.runtime in the "runtime" linker namespace."

No longer required for hwasan builds, since b/140790209 is fixed.

This reverts change-id I27069b20f7c7068b931340f548b284ce1676466c.

This also reverts the identified change for the memory regression in
b/140648539.

Test: Build & boot on taimen_hwasan-userdebug
Test: Build & boot on crosshatch_hwasan-userdebug
Bug: 140790209
Bug: 139408016
Bug: 140648539
Change-Id: Ib61c53571a4de0970a86ebc391a2ce780247943a