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This patch puts the description of the different programmers into a
separate section of the manpage instead of having them one after the
other without visual structuring in the description of "-p". It is
made as a preparation of a man-page patch that adds the background
of board enables into flashrom.8 that would really blow up the OPTIONS
section.

The only differences in content are:
 - The parameter for serprog is mandatory, not optional
 - Default behaviour of it87spi (using BIOS-set I/O address) is mentioned.
 - Default speed of buspiratespi is mentioned.

Corresponding to flashrom svn r922.
Signed-off-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>