gallium: Add dmabuf arg to memory fd allocation API

Modify the memory fd allocation API to provide an argument to specify
if the allocating fd should be a dmabuf.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27805>

src/gallium/include/pipe/p_screen.h

@@ -667,7 +667,8 @@ struct pipe_screen {
     */
    struct pipe_memory_allocation *(*allocate_memory_fd)(struct pipe_screen *screen,
                                                         uint64_t size,
-                                                        int *fd);
+                                                        int *fd,
+                                                        bool dmabuf);
 
    /**
     * Import memory from an fd-handle.
@@ -675,7 +676,8 @@ struct pipe_screen {
    bool (*import_memory_fd)(struct pipe_screen *screen,
                             int fd,
                             struct pipe_memory_allocation **pmem,
-                            uint64_t *size);
+                            uint64_t *size,
+                            bool dmabuf);
 
    /**
     * Free previously allocated fd-based memory.