This is kind of a pre CAR patch to properly allocate "shared" graphics memory

This is kind of a pre CAR patch to properly allocate "shared" graphics memory
area.

CONFIG_GFXUMA is used in src/cpu/x86/mtrr/mtrr.c which is called by the cpu.

Attached is a revised patch which works well.

Signed-off-by: Joseph Smith <joe@settoplinux.org>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
See boot snips below:

Root Device assign_resources, bus 0 link: 0
8MB IGD UMA
Available memory: 581632KB
PCI_DOMAIN: 0000 assign_resources, bus 0 link: 0
----------------------------
Adding high table area
Adding UMA memory area
coreboot memory table:
 0. 0000000000000000-0000000000000fff: CONFIGURATION TABLES
 1. 0000000000001000-000000000009ffff: RAM
 2. 0000000000100000-00000000237effff: RAM
 3. 00000000237f0000-00000000237fffff: CONFIGURATION TABLES
 4. 0000000023800000-0000000023ffffff: RESERVED

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5243 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1