RDMA/irdma: Add a missing kfree of struct irdma_pci_f for GEN2

RDMA/irdma: Add a missing kfree of struct irdma_pci_f for GEN2

During a refactor of the irdma GEN2 code, the kfree of the irdma_pci_f struct
in icrdma_remove(), which was originally introduced upstream as part of
commit 80f2ab46c2ee ("irdma: free iwdev->rf after removing MSI-X")
was accidentally removed.

Fixes: 0c2b80cac96e ("RDMA/irdma: Refactor GEN2 auxiliary driver")
Signed-off-by: Krzysztof Czurylo <krzysztof.czurylo@intel.com>
Signed-off-by: Tatyana Nikolova <tatyana.e.nikolova@intel.com>
Link: https://patch.msgid.link/20251125025350.180-4-tatyana.e.nikolova@intel.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>