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The OID module is used by both crypto and X.509. It has moved to the `tf-psa-crypto` subdirectory, and the sibling commit 08d8cc57dbe7be54fe3f88ecbc2729300c48d450 removes this subdirectory from the `mbedtls` repository in order to make `tf-psa-crypto` a submodule. We want to access the relevant parts directly from X.509 rather than go through the crypto repository, because OID functions are only accessible as private interfaces, and crypto doesn't know when a particular OID function is needed in the build since it depends on X.509 configuration options. Make a copy of the OID module and its unit tests. In a follow-up, the X.509 module will switch to consuming this copy rather than the one that went into TF-PSA-Crypto. Rename the files from `*oid*` to `*x509_oid*` to follow the naming convention that submodules of X.509 are prefixed with `x509`. This also avoids file name clashes with TF-PSA-Crypto. Since OID is not a public interface of Mbed TLS 4.x, move the header file into `library`. This commit only makes the files available. Subsequent commits will take care of making these files used in the build. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>