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When initializing a multipart or interruptible operation structure, use an
auxiliary function that doesn't initialize union members to all-bits-zero.
Context: on most compilers, initializing a union to `{0}` initializes it to
all bits zero; but on some compilers, the trailing part of members other
than the first is left uninitialized. This way, we can run the tests on any
platform and validate that the code would work correctly on platforms where
union initialization is short.
This commit makes a systematic replacement in `test_suite_psa_crypto.function`
and `test_suite_psa_crypto_driver_wrappers.function`, which gives good
enough coverage.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>