Subject: [PATCH] blk-mq: Enhance blk_mq_virtio_map_queues for dynamic vector allocation

The function blk_mq_virtio_map_queues currently assumes that the number of available interrupt vectors in the virtio device is equal to or greater than the number of queues. However, this assumption may not always hold true, especially in scenarios where the number of vectors is less than the number of queues.

This patch enhances blk_mq_virtio_map_queues to support dynamic allocation of interrupt vectors. If the number of available vectors is less than the number of queues, the function now dynamically allocates vectors and assigns queues accordingly.

This enhancement ensures better compatibility and scalability for systems with virtio devices where the number of vectors may be limited.

Signed-off-by: SushilkumarDev   || sushilkumardeveloper@gmail.com