net/mlx5: fix indexed pool bitmap initialization

net/mlx5: fix indexed pool bitmap initialization

Currently, the indexed memory pool bitmap start address is not aligned
to cacheline size explicitly. The bitmap initialization requires the
address should be cacheline aligned. In that case, the initialization
maybe failed if the address is not cacheline aligned.

Add RTE_CACHE_LINE_ROUNDUP() to the trunk size calculation to make sure
the bitmap offset address will start with cacheline aligned.

Fixes: a3cf59f56c47 ("net/mlx5: add indexed memory pool")

Signed-off-by: Suanming Mou <suanmingm@mellanox.com>
Tested-by: Lijian Zhang <lijian.zhang@arm.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>