mm: cma: Export cma_alloc(), cma_release() and cma_get_name()

The CMA dma-buf heap uses cma_alloc() and cma_release() to allocate and
free, respectively, its CMA buffers, and cma_get_name() to get the name
of the heap instance it's going to create.

However, these functions are not exported. Since we want to turn the CMA
heap into a module, let's export them both.

Reviewed-by: T.J. Mercier <tjmercier@google.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20260331-dma-buf-heaps-as-modules-v4-5-e18fda504419@kernel.org

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