Fix Android system memory requirements

Fix Android system memory requirements

This CL changes how the available system memory is defined in Android.
The actual available system memory size is now used instead of
determining the available system memory by the CDD.

Affects:

dEQP-VK.api.buffer.suballocation.*
dEQP-VK.api.buffer.dedicated_alloc.*
dEQP-VK.api.object_management.*
dEQP-VK.memory.allocation.*
dEQP-VK.memory.device_group_allocation.*
dEQP-VK.pipeline.render_to_image.*.small.*
dEQP-VK.pipeline.render_to_image.*.huge.*

Components: Framework, Vulkan

VK-GL-CTS issue: 2621

Change-Id: I92fd157ec3928313ac92c29e6cbb3413c64a5096