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CMA features may ifdef out parts of the code with
CONFIG_CMA. Older code uses CONFIG_DMA_CMA. Switch
to using the newer CONFIG_CMA to ensure the code gets
compiled when needed.

Change-Id: I3cae639797787b4926a6c5e057de973b66196707
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Neha Pandey <nehap@codeaurora.org>