`pkg/portutil/procnet`lacks support for big endian (i.e., s390x)

[AkihiroSuda]

nerdctl/pkg/portutil/procnet/procnet.go

Line 77 in ca6ced0

// Not sure how those entries look like on big endian machines.

The support for the big endian was implemented in the Lima upstream in lima-vm/lima@da5fb5e

[Shubhranshu153]

I can pick this up for the week.