sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

spi flash: Remove unused devclass arguments to DRIVER_MODULE.

flash: Remove unused variables.

Ever since the block layer expanded its command syntax beyond just
BIO_READ and BIO_WRITE, we've handled this expanded syntax poorly in
drivers when the driver doesn't support a particular command. Do a
sweep and fix that.

Reported by: imp

Regularize my copyright notice

o Remove All Rights Reserved from my notices
o imp@FreeBSD.org everywhere
o regularize punctiation, eliminate date ranges
o Make sure that it's clear that I don't claim All Rights reserved by listing
All Rights Reserved on same line as other copyright holders (but not
me). Other such holders are also listed last where it's clear.

Remove All Rights Reserved

Remove the all rights reserved clause from my copyright, and make
other minor tweaks needed where that might have created ambiguity.

The device ID tables are used only within the driver, make them static so
that both of these drivers can exist in the same kernel.

Add driver for Cadence Quad SPI Flash Controller found on
Intel® Arria® 10 SoC.

Cadence Quad SPI Flash is not generic SPI controller, but SPI flash
controller, so don't use spibus here, instead provide quad spi flash
interface.

Since it is not on spibus, then mx25l flash device driver is not usable
here, so provide new n25q flash device driver with quad spi flash
interface.

Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D10245