Don't relocate "varlow" variable references at runtime.

Since the final location of the "varlow" variables are known at build
time, link the final locations into the binary during the build.  The
16bit code was already done at link time - update the build so the
32bit code is also done at link time.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Move malloc's ZoneFSeg and ZoneLow setup to malloc_init.

This reduces some duplicate code between malloc_preinit() and
csm_malloc_preinit().

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Calculate "RamSize" needed by 16bit interface dynamically.

Calculate a LegacyRamSize directly from the e820 map for use by
handle_1588() and handle_15e801() (the only two external interfaces
that require "RamSize").  All other users of the existing RamSize (and
RamSizeOver4G) variables are specific to QEMU, so move the
declarations to paravirt.c.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Eliminate separate BiosTableSpace[] space for f-segment allocations.

The BiosTableSpace variable was used to ensure there was sufficient
space in the f-segment for malloc_fseg() calls.  However, it added 2K
to the final image size to reserve that space.

Update the build to determine where to put the f-segment allocations.
In most cases (when code relocation is enabled) allocations can be
done in the space free'd from the "init" sections and no additional
space needs to be reserved in the final image.  This also has the
benefit of not fragmenting the f-segment allocation space.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>