nehalem: Make UMA size configurable in CMOS.

All modes tested on X201.

Change-Id: I23df81523196ea3f5fdb10eb04f4496c00aaeb9f
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6481
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/mainboard/packardbell/ms2290/cmos.layout

@@ -84,6 +84,9 @@ entries
 409          2       e       7        power_on_after_fail
 411         1       e       9        sata_mode
 
+# coreboot config options: northbridge
+424         3       e       10       gfx_uma_size
+
 # coreboot config options: check sums
 984         16       h       0        check_sum
 #1000        24       r       0        amd_reserved
@@ -123,6 +126,12 @@ enumerations
 8     1     Primary
 9     0     AHCI
 9     1     Compatible
+10    0     32M
+10    1     48M
+10    2     64M
+10    3     128M
+10    5     96M
+10    6     160M
 # -----------------------------------------------------------------
 checksums