admin: use more dynamic method of setting recipe read-only fields

Every time we add something that links to Recipe we had to add it to the
exclusions list in the readonly_fields line for RecipeAdmin (and
ClassicRecipeAdmin), which is tedious and easily forgotten. We can avoid
this by looking at each field and excluding it by its attributes rather
than having a hardcoded list of names.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

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