libkern: add ilog2 macro

The kernel source contains several definitions of an ilog2 function;
some are slower than necessary, and one of them is incorrect.
Elimininate them all and define an ilog2 macro in libkern to replace
them, in a way that is fast, correct for all argument types, and, in a
GENERIC kernel, includes a check for an invalid zero parameter.

Folks at Microsoft have verified that having a correct ilog2
definition for their MANA driver doesn't break it.

Reviewed by: alc, markj, mhorne (older version), jhibbits (older version)
Differential Revision: https://reviews.freebsd.org/D45170
Differential Revision: https://reviews.freebsd.org/D45235

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

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

Remove support for ancient compilers

We don't support building the kernel from such old compilers, nor with
the Intel Compiler specifically. Remove support for this old construct
that was copied from stdbool.h and not relevant here.

dev/bxe: make use of mallocarray(9).

Use mallocarray in a couple of cases where a calloc-like operation is
taking place.

sys/dev: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

sys/dev: minor spelling fixes.

Most affect comments, very few have user-visible effects.

Upgrade the firmware carried in driver and loaded during hardware
initialization (a.k.a STORM firmware) to version 7.13.1 (latest version)

For ECORE_DBG_BREAK_IF() ECORE_BUG() ECORE_BUG_ON() check bxe_debug flag before
printing error message.

MFC after:5 days

Initiate error recovery stats fail to update after 3 retries.
Change bxe_panic() ECORE_DBG_BREAK_IF() ECORE_BUG() ECORE_BUG_ON() to
panic only if ECORE_STOP_ON_ERROR is defined.

MFC after:5 days

Modify Copyright information to reflect Qlogic Corporation's purchase
of Broadcom's NetXtreme business

Submitted by:David C Somayajulu (davidcs@freebsd.org) QLogic Corporation
MFC after:5 days

Fixed a tx watchdog chip reset that could occur on mostly idle links.
Fixed various link related issues and 10GBaseT is now linking properly.
Modified the types for the driver tunables to be consistent with the sysctl APIs.

Approved by: davidch (mentor)

Fixed the media type shown via ifconfig.
Fixed a panic that occurs when bringing up an interface on 57710/57711
running very old bootcode versions.
Fixed how bool is defined for those who have been using this code on older
versions of FreeBSD.

Approved by: re@ (gjb)
Approved by: davidch (mentor)

Substantial rewrite of bxe(4) to add support for the BCM57712 and
BCM578XX controllers.

Approved by: re
MFC after: 4 weeks