dma-heap: add a new internal backend This backend allocates dma-bufs from dma-heaps. It is generic and only supports blobs. It is a full backend like other backends. But it is also internal in the sense that it is declared in drv_helpers.h and is never auto-selected by drv_create. It is also the only driver that is not based on DRM/GEM. As a result, drv->fd is dma-heap fd rather than a drm fd. bo->handle.u32 is a dma-buf fd rather than a gem handle. BUG=b:446040761 TEST=boot navi Change-Id: If5e274b254652ed9cc5be6f3b9d0a3defc8bea44 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/6967760 Reviewed-by: Yiwei Zhang <zzyiwei@google.com> Auto-Submit: Chia-I Wu <olv@google.com> Tested-by: Chia-I Wu <olv@google.com> Commit-Queue: Chia-I Wu <olv@google.com> Reviewed-by: Ryan Neph <ryanneph@google.com>
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