4a2da6ea45
Below logic allocates the host buffer whenever a subbuffer is created
from a SVM allocation. This is only needed for multi-device contexts.
HIP does not support multi-device contexts, hence this logic just ends
up performing unnecessary system allocations.
Change-Id: I8eae635f7c5289c52ef73434218c1658b788a456
[ROCm/clr commit: ffbf368f4c]