net/ice: fix memzone reserve and release in flow director

net/ice: fix memzone reserve and release in flow director

To avoid memzone reserve failure and memory leak, following
resources management should be added.
- Check if the FDIR Memzone already exists before reserving.
- Free FDIR memzone when teardown and other failure scenarios.

Fixes: 84dc7a95a2d3 ("net/ice: enable flow director engine")

Signed-off-by: Shougang Wang <shougangx.wang@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Xiaolong Ye <xiaolong.ye@intel.com>