cma: Remove potential deadlock situation
CMA locking is currently very coarse. The cma_mutex protects both the bitmap and avoids concurrency with alloc_contig_range. There are several situations which may result in a deadlock on the CMA mutex currently, mostly involving AB/BA situations with alloc and free. Fix this issue by protecting the bitmap with a mutex per CMA region and use the existing mutex for protecting against concurrency with alloc_contig_range. Signed-off-by: NLaura Abbott <lauraa@codeaurora.org> Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com>
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