atiext: Add DDC type to tables for radeon Linux driver (KMS)

The connector info section needs a non-zero value in the DDC
type field. Zero causes the Linux radeon driver to fail to initialize the DDC
bus and then no connectors are found. DDC_DVI (0x2) is used here so that
the GPIO_DVI_DDC register is used for the radeon. From what I have seen
r128 drivers ignore this field entirely.

Tested on Debian Squeeze (Linux 2.6.32) and Debian Trixie (Linux 6.12.94)
with:

qemu-system-x86_64 -vga none -device ati-vga,model=rv100,vgamem_mb=32

Signed-off-by: Chad Jablonski <chad@jablonski.xyz>