util/mb/google: Update dalboz/trembyle template

- Fix relative path to spd folder.
- Add spd folder with empty files.

BUG=None
TEST=None

Change-Id: Iae88ff9c8255f60544312f0eeadf1ce617437baf
Signed-off-by: Rob Barnes <robbarnes@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44947
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>

util/mainboard/google/dalboz/template/Makefile.inc

@@ -1,3 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
-subdirs-y += ../baseboard/spd
+subdirs-y += ./spd