Move libnv into the kernel and hook it into the kernel build

Differential Revision:		https://reviews.freebsd.org/D1883
Reviewed by:			jfv
MFC after:			1 month
Sponsored by:			Sandvine Inc.

lib/libnv/Makefile

@@ -7,10 +7,13 @@ SHLIBDIR?= /lib
 LIB=	nv
 SHLIB_MAJOR= 0
 
-SRCS=	dnvlist.c
+.PATH: ${.CURDIR}/../../sys/kern ${.CURDIR}/../../sys/sys
+CFLAGS+=-I${.CURDIR}/../../sys -I${.CURDIR}
+
+SRCS=	subr_dnvlist.c
 SRCS+=	msgio.c
-SRCS+=	nvlist.c
-SRCS+=	nvpair.c
+SRCS+=	subr_nvlist.c
+SRCS+=	subr_nvpair.c
 
 INCS=	dnv.h
 INCS+=	nv.h

sys/conf/files

@@ -3076,6 +3076,7 @@ kern/subr_clock.c		standard
 kern/subr_counter.c		standard
 kern/subr_devstat.c		standard
 kern/subr_disk.c		standard
+kern/subr_dnvlist.c		standard
 kern/subr_eventhandler.c	standard
 kern/subr_fattime.c		standard
 kern/subr_firmware.c		optional firmware
@@ -3089,6 +3090,8 @@ kern/subr_mbpool.c		optional libmbpool
 kern/subr_mchain.c		optional libmchain
 kern/subr_module.c		standard
 kern/subr_msgbuf.c		standard
+kern/subr_nvlist.c		standard
+kern/subr_nvpair.c		standard
 kern/subr_param.c		standard
 kern/subr_pcpu.c		standard
 kern/subr_pctrie.c		standard

sys/kern/subr_dnvlist.c

@@ -47,10 +47,10 @@ __FBSDID("$FreeBSD$");
 #include <stdlib.h>
 #endif
 
-#include "nv.h"
-#include "nv_impl.h"
+#include <sys/nv.h>
+#include <sys/nv_impl.h>
 
-#include "dnv.h"
+#include <sys/dnv.h>
 
 #define	DNVLIST_GET(ftype, type)					\
 ftype									\

sys/kern/subr_nvlist.c

@@ -56,17 +56,18 @@ __FBSDID("$FreeBSD$");
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+
+#include "msgio.h"
 #endif
 
 #ifdef HAVE_PJDLOG
 #include <pjdlog.h>
 #endif
 
-#include "msgio.h"
-#include "nv.h"
-#include "nv_impl.h"
-#include "nvlist_impl.h"
-#include "nvpair_impl.h"
+#include <sys/nv.h>
+#include <sys/nv_impl.h>
+#include <sys/nvlist_impl.h>
+#include <sys/nvpair_impl.h>
 
 #ifndef	HAVE_PJDLOG
 #ifdef _KERNEL

sys/kern/subr_nvpair.c

@@ -52,17 +52,18 @@ __FBSDID("$FreeBSD$");
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+
+#include "common_impl.h"
 #endif
 
 #ifdef HAVE_PJDLOG
 #include <pjdlog.h>
 #endif
 
-#include "common_impl.h"
-#include "nv.h"
-#include "nv_impl.h"
-#include "nvlist_impl.h"
-#include "nvpair_impl.h"
+#include <sys/nv.h>
+#include <sys/nv_impl.h>
+#include <sys/nvlist_impl.h>
+#include <sys/nvpair_impl.h>
 
 #ifndef	HAVE_PJDLOG
 #ifdef _KERNEL