Use 6GB dalvik-heap config for WHI series phones

Since all the WHI phones have 6GB+ RAM, we should be using at least a
6GB dalvik-heap config, as being done in pixel5 and older devices.

Test: build and boot
Bug: 189738006
Change-Id: I5a232d2901dec819b225812d023d2e5a43d3e0a6
1 file changed