[PATCH][AArch64][SVE][Newlib] Initialize SVE system registers.

[Tamar Christina]

Hi All,

This patch initializes the SVE system registers if available
and initializes the vector length to the maximum supported.

This is done according to the SVE specification [1].

[1] https://developer.arm.com/docs/ddi0584/latest/arm-architecture-reference-manual-supplement-the-scalable-vector-extension-sve-for-armv8-a

Compiled aarch64-none-elf and no issues.

Ok for master?

PS. I don't have commit rights so if OK can someone commit for me?

Thanks,
Tamar
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