nehalem: Replace video init.

Old video init just replayed the sequence.
This one actually computes the values.

Change-Id: Ic1fe7a2e90dc2cc36ac0d8bcea5cfabc583f09a3
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/5270
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

src/northbridge/intel/nehalem/Kconfig

@@ -23,6 +23,7 @@ config NORTHBRIDGE_INTEL_NEHALEM
 	select MMCONF_SUPPORT
 	select MMCONF_SUPPORT_DEFAULT
 	select VGA
+	select INTEL_EDID
 
 if NORTHBRIDGE_INTEL_NEHALEM