bpf: switch sessionAffinity to more lightweight mono clock source
bpf: switch sessionAffinity to more lightweight mono clock source

... which uses jiffies if possible and otherwise falls back to ktime. See
also commit cd7921feacc0 ("bpf: implement time source switch and use it in
CT") for more information wrt ktime vs jiffies.

Signed-off-by: Daniel Borkmann <3d0f3b9ddcacec30c4008c5e030e6c13a478cb4f@iogearbox.net>

michi-covalent/cilium,cilium/cilium,tgraf/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,cilium-team/cilium,tgraf/cilium,cilium/cilium,tklauser/cilium,tklauser/cilium,michi-covalent/cilium,tklauser/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium,michi-covalent/cilium,tklauser/cilium,cilium/cilium,tklauser/cilium,cilium-team/cilium