Embedding curve_data into built_in_curve simplifies things a bit.

Change-Id: Ibd364df7bb39a04c257df30ad28f26223c25c196
Reviewed-on: https://boringssl-review.googlesource.com/17304
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Adam Langley <agl@google.com>
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This avoids depending the FIPS module on crypto/bytestring and moves
ECDSA_SIG_{new,free} into the module.

Change-Id: I7b45ef07f1140873a0da300501141b6ae272a5d9
Reviewed-on: https://boringssl-review.googlesource.com/15984
Reviewed-by: Adam Langley <agl@google.com>

The names in the P-224 code collided with the P-256 code and thus many
of the functions and constants in the P-224 code have been prefixed.

Change-Id: I6bcd304640c539d0483d129d5eaf1702894929a8
Reviewed-on: https://boringssl-review.googlesource.com/15847
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
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