cxgb4: Remove unused cxgb4_alloc/free_raw_mac_filt

cxgb4: Remove unused cxgb4_alloc/free_raw_mac_filt

cxgb4_alloc_raw_mac_filt() and cxgb4_free_raw_mac_filt() have been
unused since they were added in 2019 commit
5fab51581f62 ("cxgb4: Add MPS TCAM refcounting for raw mac filters")

Remove them.

This was also the last use of cxgb4_mps_ref_dec().
Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Link: https://patch.msgid.link/20241013203831.88051-3-linux@treblig.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>