cb/kabylake: don't hardcode power_on_after_fail

I realised that the Dell OptiPlex 3050 Micro has NVRAM available.
Use that backend, and hardcode power_on_after_fail to Disable,
which is already done in cmos.default.

The Lenovo ThinkPad T480 currently has no option table in coreboot,
besides the CBFS one. For this, the CBFS option table has been
enabled, and the build system has been modified to insert
a relevant config for power_on_after_fail.

Nicholas Chin informs me that Kabylake generally has legacy NVRAM,
so enabling it for the T480/T480s should work, but we'll need
to use it in the future anyway; better to just use CBFS now.

I *could* use the CBFS backend on 3050micro as well.

Signed-off-by: Leah Rowe <leah@libreboot.org>

config/coreboot/default/patches/0023-Disable-compression-on-refcode-insertion.patch

@@ -1,7 +1,7 @@
-From 4dfcaaffc1fe01cd7676f804a7f1fd5f899beb36 Mon Sep 17 00:00:00 2001
+From 89ecd79ab46f56c65c0b5720d1c84b12698a02b4 Mon Sep 17 00:00:00 2001
 From: Leah Rowe <info@minifree.org>
 Date: Tue, 31 Dec 2024 14:42:24 +0000
-Subject: [PATCH 23/35] Disable compression on refcode insertion
+Subject: [PATCH 23/40] Disable compression on refcode insertion
 
 Compression is not reliably reproducible. In an lbmk release
 context, this means we cannot rely on vendorfile insertion.
@@ -27,5 +27,5 @@ index 218e388bb5..a2163c4644 100644
  cbfs-files-$(CONFIG_SEABIOS_VGA_COREBOOT) += vgaroms/seavgabios.bin
  vgaroms/seavgabios.bin-file := $(CONFIG_PAYLOAD_VGABIOS_FILE)
 -- 
-2.39.5
+2.47.3