test: Add fsetup fixture and prepare helper for FIT test

Create an 'fsetup' fixture which sets up files and parameters, and a
prepare() helper which builds a FIT with given parameter overrides.

Update check_equal() and check_not_equal() to look up filenames from a
params dict by key, reducing the number of local variables needed.

Split the single test_fit_operations() into individual test functions so
that each appears separately in the results.

Signed-off-by: Simon Glass <[email protected]>

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