camera 2.4: conditionally disable memory init

This needs to be disabled on Pixel 3, but this is the only place w/
source code visible in AOSP. So, it is implemented as a mechanism.

Bug: 166675194
Test: atest android.hardware.camera2.cts.PerformanceTest
Change-Id: I0d91389432906a917696d27d27b4d6d96e64d09f