octeontx2-af: Fix mcam entry resource leak

In the Linux kernel, the following vulnerability has been resolved:

octeontx2-af: Fix mcam entry resource leak

The teardown sequence in FLR handler returns if no NIX LF

is attached to PF/VF because it indicates that graceful

shutdown of resources already happened. But there is a

chance of all allocated MCAM entries not being freed by

PF/VF. Hence free mcam entries even in case of detached LF.