select "fips" pattern (bnc#886582)

if installation is booted with "fips=1" parameter

- 3.1.29
If you look at the laptop code above, we could use a helper
```ruby
def add_pattern_if_present!(array, pattern)
  if !Pkg.ResolvableProperties(pattern, :pattern, "").empty?
    array << pattern
  end
end

if Arch.is_laptop || Arch.has_pcmcia
  add_pattern_if_present!(pattern_list, "laptop")
  add_pattern_if_present!(pattern_list, "Laptop")
end
if (Linuxrc.InstallInf("Cmdline") || "").split.include?("fips=1")
  add_pattern_if_present!(pattern_list, "fips")
end
```