For APU asics, the default configuration size of video memory is
relatively small, plus the reserved region, ratio of max alloc size to
the pool size may below the expected value, so adjust it.
Change-Id: I798b44d9532aa6a381a1cc19faa5a46110bf0ad6
[ROCm/ROCR-Runtime commit: df59bfd57b]
This is to allow allocations in system memory that exceed sizes
reported by a CPU device
Change-Id: I3d10d192aafcefbe4107f69b7c5e30bf7f836619
[ROCm/ROCR-Runtime commit: 3201f68f72]