ICH9M: default to 256MB VRAM, not 352MB

352MB VRAM causes stability issues, according to some reports

users can still set it to the higher level when building, if
they wish to

resources/coreboot/default/patches/0017-util-ifdtool-fix-bad-patch.patch

@@ -1,7 +1,7 @@
-From 8af41a8f60665cd73daa2d79e6a011b25f1957c2 Mon Sep 17 00:00:00 2001
+From 05b8acae9a88b8dd13dd96facca30e4662399053 Mon Sep 17 00:00:00 2001
 From: Leah Rowe <leah@libreboot.org>
 Date: Sun, 19 Feb 2023 23:20:10 +0000
-Subject: [PATCH 1/1] util/ifdtool: fix bad patch
+Subject: [PATCH 17/18] util/ifdtool: fix bad patch
 
 i messed up the "rebase" a few lbmk commits ago
 ---
@@ -61,5 +61,5 @@ index 5509721018..89feb99536 100644
  		return -1;
  }
 -- 
-2.30.2
+2.39.2