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When setting CMA up at a fixed region, it is possible for the address to be shared between multiple subsystems. If the address is placed dynamically, there is no mechanism to be able to get the start address of the region. Drivers may wish to do keep track of allocations relative to the start address so add an API to get the start region of a CMA address. Change-Id: If0730c64496c876d3143064d767b22b984c6dc84 Signed-off-by: Laura Abbott <lauraa@codeaurora.org>