sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

wpi, rum and urtwn: update copyright headers

Approved by: adrian (mentor)
Differential Revision: https://reviews.freebsd.org/D4489

Fix warning about comparison of integers of different signs.

PR: kern/197143
Submitted by: Andriy Voskoboinyk <s3erios@gmail.com>

Try to fix passive scanning hang on beacon miss.

PR: kern/197143
Submitted by: Andriy Voskoboinyk <s3erios@gmail.com>

Create another debug category for WPI_BEACON_MISSED notification.

Differential Revision: kern/197143
Submitted by: Andriy Voskoboinyk <s3erios@gmail.com>

Fix KASSERT statements in if_wpi_debug.h

PR: kern/197143
Submitted by: Andriy Voskoboinyk <s3erios@gmail.com>

Add WPI_DEBUG_NODE + some debugging.

PR: kern/197143
Submitted by: Andriy Voskoboinyk <s3erios@gmail.com>

* Add new debug category
* Refactor out / restructure / extend debugging information

PR: kern/197143
Submitted by: Andriy Voskoboinyk <s3erios@gmail.com>

Big wpi(4) overhaul! Not by me!

This is a sync against iwn(4) and openbsd.

- Add power management support;
- Add background scanning support;
- Fix few LORs;
- Handle rfkill switch state changes properly;
- Fix recovering after firmware failure;
- Add more error checking;
- Cleanup & disable by default debug output;
- Update macroses names;
- Other various fixes;
- Add IBSS support:
- don't set data_ntries field for management frames;
- Add AHDEMO support:
- fix padding;
- Sync eeprom functions;
- Use CMD_RXON_ASSOC where possible;
- Enable HW CCMP encryption/decryption for pairwise keys;
- Fix filter flags for CMD_RXON.

Tested (by submitter) - iwn 3945 NIC. I have one somewhere; I'll
validate this later on and revert it if it's a problem.

Thanks!

PR: 197143
Submitted by: Andriy Voskoboinyk <s3erios@gmail.com>