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2021-10-03T05:06:08.466084Z
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iflib: Make if_shared_ctx_t a pointer to const

This structure is shared among multiple instances of a driver, so we
should ensure that it doesn't somehow get treated as if there's a
separate instance per interface.  This is especially important for
software-only drivers like wg.

DEVICE_REGISTER() still returns a void * and so the per-driver sctx
structures are not yet defined with the const qualifier.

Reviewed by:	gallatin, erj
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D29102

(cherry picked from commit ffe3def903a5f239c319e5fe12450659658974a5)

Git Hash:   3a13449e4daa28fd7be43c91017212818006ed5c
Git Author: markj@FreeBSD.org
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