Add NTB modules to i386 build.

There is no reason why NTB should not be usable on i386 if memory windows
are small enough.

share/man/man4/Makefile

@@ -790,6 +790,11 @@ _nda.4=		nda.4
 _ndis.4=	ndis.4
 _nfe.4=		nfe.4
 _nfsmb.4=	nfsmb.4
+_if_ntb.4=	if_ntb.4
+_ntb.4=		ntb.4
+_ntb_hw_intel.4=	ntb_hw_intel.4
+_ntb_hw_plx.4=	ntb_hw_plx.4
+_ntb_transport.4=ntb_transport.4
 _nvd.4=		nvd.4
 _nvme.4=	nvme.4
 _nvram.4=	nvram.4
@@ -817,12 +822,7 @@ _xnb.4=		xnb.4
 .endif
 
 .if ${MACHINE_CPUARCH} == "amd64"
-_if_ntb.4=	if_ntb.4
 _ioat.4=	ioat.4
-_ntb.4=		ntb.4
-_ntb_hw_intel.4=	ntb_hw_intel.4
-_ntb_hw_plx.4=	ntb_hw_plx.4
-_ntb_transport.4=ntb_transport.4
 _qlxge.4=	qlxge.4
 _qlxgb.4=	qlxgb.4
 _qlxgbe.4=	qlxgbe.4

sys/modules/Makefile

@@ -594,6 +594,7 @@ _lio=		lio
 .endif
 _nctgpio=	nctgpio
 _ndis=		ndis
+_ntb=		ntb
 _ocs_fc=	ocs_fc
 _pccard=	pccard
 .if ${MK_OFED} != "no" || defined(ALL_MODULES)
@@ -691,7 +692,6 @@ _ioat=		ioat
 _ixl=		ixl
 _linux64=	linux64
 _linux_common=	linux_common
-_ntb=		ntb
 _nvdimm=	nvdimm
 _pms=		pms
 _qlxge=		qlxge