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[S390x] Optimize scalar multiply of Curve25519 and Curve448 defined in RFC-7748

Maamoun TK requested to merge mamonet/nettle:s390x-ecc-7748 into master

This patch implements scalar multiply of Curve25519 and Curve448 defined in RFC-7748 (also support group functions) on S390x architecture using hardware-accelerated instruction pcc.

testsuite passes all tests of this patch.

Benchmark on z15

Function C This patch
curve25519_mul 366 (us) 17 (us)
curve25519_mul_g 129 (us) 17 (us)
curve448_mul 1748 (us) 35 (us)
curve448_mul_g 624 (us) 35 (us)
Edited by Maamoun TK

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