[coreboot] Patch: J2F[24] mainboard

[Alex Mauer]

Attached please find a patch to add the "jetway j7f[24]*" mainboard.  As
compared to the Via Epia CN, this changes the superio to a Fintek
F71805F as described at http://www.coreboot.org/Jetway_J7F2_Build_Tutorial

It also creates the mainboard tree for this series of motherboards
(Jetway J7F2 and J7F4).  I've tested it with one motherboard
(J7F2WE1G3), and I believe it works with the others, as the differences
among them are mostly trivial (processor speed, chipset and quantity of
LAN cards, audio chipset, etc.).  A list of the relevant motherboards
with specs can be found at
http://www.jetway.com.tw/jw/ipcboard_socket.asp?platid=16

The irq_tables.c is copied directly from the epia-cn, because the one
generated by getpir with the factory BIOS did not work properly while
the EPIA-CN one did.

Signed-off-by: Alex Mauer <hawke at hawkesnest.net>

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