NEON implementation
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Description

Improve performance of SHA-512/ARM/NEON implementation

* cipher/sha512-armv7-neon.S (RT01q, RT23q, RT45q, RT67q): New.
(round_0_63, round_64_79): Remove.
(rounds2_0_63, rounds2_64_79): New.
(_gcry_sha512_transform_armv7_neon): Add 'nblks' input; Handle multiple
input blocks; Use new round macros.
* cipher/sha512.c [USE_ARM_NEON_ASM]
(_gcry_sha512_transform_armv7_neon): Add 'num_blks'.
(transform) [USE_ARM_NEON_ASM]: Pass nblks to assembly.

Benchmarks on ARM Cortex-A8:

C-language: 139.1 c/B
Old ARM/NEON: 34.30 c/B
New ARM/NEON: 24.46 c/B

New vs C: 5.68x
New vs Old: 1.40x