mb/google/nissa: Create craaskov variant

Create the craaskov variant of the nissa reference board by copying
the template files to a new directory named for the variant.

(Auto-Generated by create_coreboot_variant.sh version 4.5.0.)

BUG=b:290248526
BRANCH=None
TEST=util/abuild/abuild -p none -t google/brya -x -a
make sure the build includes GOOGLE_CRAASKOV

Change-Id: I1d12f7c3d0ef7067f4530c1c69c560f9a83561f6
Signed-off-by: Rex Chou <rex_chou@compal.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76405
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Dtrain Hsu <dtrain_hsu@compal.corp-partner.google.com>
Reviewed-by: Derek Huang <derekhuang@google.com>
Reviewed-by: Ian Feng <ian_feng@compal.corp-partner.google.com>
diff --git a/src/mainboard/google/brya/variants/craaskov/memory/Makefile.inc b/src/mainboard/google/brya/variants/craaskov/memory/Makefile.inc
new file mode 100644
index 0000000..eace2e4
--- /dev/null
+++ b/src/mainboard/google/brya/variants/craaskov/memory/Makefile.inc
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# This is an auto-generated file. Do not edit!!
+# Add memory parts in mem_parts_used.txt and run spd_tools to regenerate.
+
+SPD_SOURCES = placeholder