sys/modules: normalize .CURDIR-relative paths to SRCTOP

This simplifies make output/logic

Tested with: `cd sys/modules; make ALL_MODULES=` on amd64
MFC after: 1 month
Sponsored by: Dell EMC Isilon

Remove EISA support from dpt. Remove known EISA models from
dpt.4. Remove EISA-only bits from dpt_scsi.c.

Cleanup the way we include some files (in this case EISA) based on
kernel config. Also tidy up the ed options.

Remove dpt_isa.c and commented out references to it. It was never connected
to the build in either sys/conf/files* or sys/modules/dpt/Makefile. Also,
it was denoted as "doesn't quite work yet" when

Remove dpt_isa.c and commented out references to it. It was never connected
to the build in either sys/conf/files* or sys/modules/dpt/Makefile. Also,
it was denoted as "doesn't quite work yet" when the file was initially added
(which may account for it never having been hooked up to the build).

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Remove dependence on source tree options. Move all kernel module
options into kern.opts.mk and change all the places where we use
src.opts.mk to pull in the options. Conditionally define SYSDIR and
u

Remove dependence on source tree options. Move all kernel module
options into kern.opts.mk and change all the places where we use
src.opts.mk to pull in the options. Conditionally define SYSDIR and
use SYSDIR/conf/kern.opts.mk instead of a CURDIR path. Replace all
instances of CURDIR/../../etc with STSDIR, but only in the affected
files.

As a special compatibility hack, include bsd.owm.mk at the top of
kern.opts.mk to allow the bare build of sys/modules to work on older
systems. If the defaults ever change between 9.x, 10.x and current for
these options, however, you'll wind up with the host OS' defaults
rather than the -current defaults. This hack will be removed when
we no longer need to support this build scenario.

Reviewed by: jhb
Differential Revision: https://phabric.freebsd.org/D529

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Use src.opts.mk in preference to bsd.own.mk except where we need stuff
from the latter.

Don't build EISA by default anymore. Remove from i386 GENERIC and
create an option that defaults to "no" on all platforms to not build
the EISA bits.

Discussed on: arch@

On i386 compile the back-end with EISA support as well as the EISA
front-end if the dpt(4) module is built along with a kernel that
includes eisa(4) or when compiling it stand-alone (logic based on
t

On i386 compile the back-end with EISA support as well as the EISA
front-end if the dpt(4) module is built along with a kernel that
includes eisa(4) or when compiling it stand-alone (logic based on
the corresponding ISA logic in sys/modules/sound/sound/Makefile).
As as side-effect this fixes the stand-alone build of the dpt(4)
module after dpt.h 1.17, dpt_eisa.c 1.22 and dpt_scsi.c 1.55.

Breakage reported by: n_hibma

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Add module infrastructure for 'dpt' driver.