[coreboot] kernel panics reserving EBDA pages

[Roman Kononov]

This patch fixes the EBDA mislocation problem. Thank you, Yinghai.

The change in coreboot_table.c is not strictly necessary. It removes
some redundancy and confusion.

The change in tables.c protects the legacy x86 BIOS data segment
(0x400-0x4ff) from being used for storing coreboot tables. Some bytes
from the segment are used by the kernel and should not be garbled.

Signed-off-by: Roman Kononov <kononov at dls.net>

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