[PATCH 0/14][Focal,Groovy][linux] Enable CIFS GCM256

[Tim Gardner]

BugLink: https://bugs.launchpad.net/bugs/1921916

[Impact]

Microsoft has asked to enable CIFS GCM256 encryption support.
SF#00307143
This looks like a safe enough feature that the manline kernel
would benefit from its inclusion. GCM256 is only enabled with
module parameters, so the default behavior remains unchanged.

[Test Plan]

Microsoft has tested Focal and Groovy mainline kernels with these
patch sets. No regression issues were found.

[Where problems could occur]

Samba servers without GCM256 support may not connect.

[Other Info]

These patches originate from v5.10 and v5.10.y. They were
recommended by the Microsoft CIFS team.