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stand/i386: Remove references to empty variable OPENCRYPTO_XTS

Description

stand/i386: Remove references to empty variable OPENCRYPTO_XTS

Reviewed by: imp
Fixes: 4728f534ff6d ("Move LOADER_{NO,}_GELI_SUPPORT to MK_LOADER_GELI")
Differential Revision: https://reviews.freebsd.org/D51598