crypto: Remove duplicate code of SG helpers functions

[LABBE Corentin]

Hello

This patch series try to remove some duplicate code of some SG helpers functions.
The first three patch replace custom functions by already in-tree helper functions.

The fourth add a new functions "sg_nents_for_len2" who is the same as
sg_nents_for_len with an additionnal arguments.
Note that I do not like the name, but I do not find any good name.

The last three patch use sg_nents_for_len2 for removing custom functions.

I send those patch as RFC since I do not own any of those hardware to test.

Regards

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