sysutils/minikube: Unbreak on i386

vendor/github.com/shirou/gopsutil/v3/process/process_freebsd.go:118:9: cannot use k.Start.Sec * 1000 + k.Start.Usec / 1000 (value of type int32) as type int64 in return statement

Convert process.Timespec fields to int64 on all archs.

Reported by: fallout
Approved by: portmgr (blanket, build fix)