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Change the test design so that requests are dynamically created
and freed. This enables running tests with more than 128 requests,
therefore more than 50MiB can be written/read and makes it possible
to measure driver write/read throughput more accurately.

Change-Id: I56c9d6c1afba5c91a0621a16d97feafd4689521d
Signed-off-by: Lee Susman <lsusman@codeaurora.org>