xen: notify ACPI about SCI override

If the SCI is remapped to a non-ISA global interrupt notify the ACPI
subsystem about the override.

Reported by: David P. Discher <dpd@dpdtech.com>
Sponsored by: Citrix Systems R&D
Skip calling CPU_ISSET for NOCPU as a short period of time we can have
td_oncpu is NOCPU for thread in TDS_RUNNING state.

Differential Revision:	https://reviews.freebsd.org/D1283
Reviewed by:	jhb
MFC after:	1 Month
ext2fs: Fix old out-of-bounds access.

Overrunning buffer pointed to by (caddr_t)&oip->i_db[0] of 48 bytes by
passing it to a function which accesses it at byte offset 59 using
argument 60UL.

The issue was inherited from an older FFS implementation and
fixed there with by merging UFS2 in r98542. We follow the
FFS fix.

Discussed with:	bde
CID:		1007665
MFC after:	3 days
Rename NETGEAR WG111V2_2 to WG111V1_2 to reflect external naming.

Reviewed by:	kevlo
o Add BERI Virtio Networking Frontend (if_vtbe)
o Move similar block/networking methods to common file
o Follow r275640 and correct MMIO registers width
o Pass value to MMIO platform_note method.

Sponsored by:	DARPA, AFRL
Merge remote-tracking branch 'freebsd/master' into hardened/current/master
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/segvguard