Add the device ID for a new flavor of FTDI serial adapter (model 232EX).
Regenerate after recent addition of FTDI and bluetooth device IDs.
pmap_protect() on MIPS does not need to acquire the pvh global lock.
Add debug trace points for freeze/release device queue.
Pay attention to errCheck!

PR:		181715
Add support for the BCM20702A0 chipset, ASUS USB-BT400.

PR:		kern/181728
Submitted by:	rakuco
system(): Restore behaviour for SIGINT and SIGQUIT.

As mentioned in r16117 and the book "Advanced Programming in the Unix
Environment" by W. Richard Stevens, we should ignore SIGINT and SIGQUIT
before forking, since it is not guaranteed that the parent process starts
running soon enough.

To avoid calling sigaction() in the vforked child, instead block SIGINT and
SIGQUIT before vfork() and keep the sigaction() to ignore after vfork(). The
FreeBSD kernel discards ignored signals, even if they are blocked;
therefore, it is not necessary to unblock SIGINT and SIGQUIT earlier.
Initial support for the Digi ConnectCore(c) i.MX53 / Wi-i.MX53 boards.

There are many drivers missing, but we can reach single user mode now.

Hardware graciously donated by Douglas Beattie.
Fix build with gcc

Reported by:	Michael Butler <imb@protected-networks.net>
Reviewed by:	jilles
Complete r250105. Do not zero fields if M_ZERO flag is specified to
malloc(9).

Reported by:	pluknet, glebius