[coreboot] PATCH: Enable Geode GLUI routing for VGA support + TIMER2 calibration

[Edwin Beasant]

This patch adds the MSR writes that are needed to provide VGA legacy routing for the Geode LX .
-          Added appropriate Kconfig defines to provide 8mb of VGA ram allocation
-          Added the Kconfig defines to cover TSC calibration from TIMER2 and UDELAY setup
-          Two small warning removals about excessive prototyping.

Tested against AMD DB800 with both FILO and SeaBios as payloads, and against Debian Testing Installer and Suse SLES 10.1 installed boot.

Signed-off-by: Edwin Beasant