Add selection of bugfixes for 6.1.y on top of 6.1.170

Ben Hutchings spotted a couple of issues and regressions in the 5.10.y series (and 6.1.y series).

One was a broken backport of "RDMA/rxe: Fix double free in rxe_srq_from_init". This adds a revert of the commit and a proper backport.

The FPDSS on Zen1 mitigations were trying to set the bit as well on other generations of Zen processors.

Lastly the apparmor backports of for 9063d7e2615f ("apparmor: validate DFA start the states are in bounds in unpack_pdb") for 5.10.y and 6.1.y series limited the bounds checks on DFA start states to the case where the start state was explicit in the policy. However, the default DFA start state (DFA_START = 1) could be out-of-bounds and the fixup patch moves the check so that the check are applied in each case, regardless of how the start state was initialised.

I kept the patch header numbers in the patches as they were in the original patchset from Ben containing in total 8 patches.