layers: GH7, Replace bad var names in obj_tracker
layers: GH7, Replace bad var names in obj_tracker

C++ reserves variable names that start with an underscore followed
by a capital letter. This patch series replaces or removes these
invalid variable names from the LVL codespace.

Change-Id: I71368cf30e267841cedcc3861afa3444689d71da

Radamanthe/VulkanSamples,Radamanthe/VulkanSamples,Radamanthe/VulkanSamples,Radamanthe/VulkanSamples,Radamanthe/VulkanSamples,Radamanthe/VulkanSamples