Enable MAP logging based on logcat value for tag

Instead of hardcoding true/false, rely on logcat settings to
enable/disable MAP logging at process start.

Bug: 196731316
Test: Logging only change. Verified logs viewable when log tag enabled.
Ignore-AOSP-First: Needed in tm-qpr release branches.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:f56043d2b762b7d43c75f25f26915b1e523e012b)
Merged-In: I2ce8f54b49850b1fa021ddfe06d160f9320a8271
Change-Id: I2ce8f54b49850b1fa021ddfe06d160f9320a8271