Avoid fixing the tty_info() buffer size in tty.h.

Avoid fixing the tty_info() buffer size in tty.h.

Different compilation units may otherwise get a different view of the
layout of struct tty depending on whether they include opt_printf.h.
This caused a blowup in the number of types defined in the kernel's
CTF file after r339468; thanks to dim@ for bisecting down to that
revision.

PR:		232675
Reported by:	dim
Reviewed by:	cem (previous version)
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17877