support AES-128-CBC / AES-128-CTS encryption modes

[jacmet]

Linux 4.13 added support for 128bit CBC/CTS modes in commit b7e7cf7a66a27
(fscrypt: add support for AES-128-CBC), so handle those in fscryptctl as
well.

Signed-off-by: Peter Korsgaard peter@korsgaard.com

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[jacmet]

I signed it!

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CLAs look good, thanks!

[josephlr]

LGTM, Thanks!