branches: 1.65.4;
Reinstate INSTALL kernel for embedded ramdisk installs.

Reasons being:
- INSTALL is GENERIC with an embedded ramdisk, and as such, can benefit from
features included within.
- INSTALL_FLOPPY has its own config(5) file, and is tailored for "small"
floppy images; it misses features/drivers that could be needed to boot
in a decent environment for recent x86 machines (like ACPI)
- makes it closer to floppies distrib available for amd64

While here, comment out INSTALL_FLOPPY and bootfloppy-big image build. NetBSD
does not use the 3.6MiB image for El Torito cdroms anymore.

Remove the FLOPPYMAX limit; i386 needs 4 floppies now. Modify boot.cfg and
release/contents to reflect reality.

See http://mail-index.netbsd.org/port-i386/2011/02/08/msg002307.html

No comments, no objections.