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

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

al: Replace boolean_t with either al_bool or bool.

Use al_bool for interfaces and structures defined in the
OS-independent HAL in sys/contrib, and use plain bool for
FreeBSD-specific APIs and structures in sys/dev/al_eth.

Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D39923

Driver for PCI Ethernet NIC on Alpine V1 and V2.

Obtained from: Semihalf
Submitted by: Michal Stanek <mst@semihalf.com>
Sponsored by: Annapurna Labs
Reviewed by: wma
Differential Revision: https://reviews.freebsd.org/D7814