Add sysctl to track the resource consumption of ACPI interrupts.

Submitted by:	gibbs
MFC after:	1 month
Sponsored by:	Spectra Logic
MFSpectraBSD:	636827 on 2012/09/28


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272360 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Remove lock init from radix.c.
Radix has never managed its locking itself.
The only consumer using radix with embeded rwlock
is system routing table. Move per-AF lock inits there.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272361 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f