Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Add spi(8), a utility for communicating with a device on a SPI bus from
userland, conceptually similar to what i2c(8) provides for i2c devices.

Submitted by: Bob Frazier
Differential Revision: https://reviews.freebsd.org/D15029