Put IMM protologs behind flag

Due to late initialization, we could end up using Protolog too early. Flagging the changes of [1], until the flag is rolled out completely.

[1]: I8eb0ab69817e57f79ab9e7bd66b037c80e3de9cd

Fix: 433297519
Test: com.vzw.hss.myverizon com.android.csuite.tests.AppLaunchTest#testAppLaunchCommonLogic
Flag: android.tracing.imetracker_protolog
Change-Id: Id40a78dc59179503bcc1bf8adf991ab72c44716b