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/0002-lenovo-t400-Enable-all-SATA-ports.patch

@@ -1,7 +1,7 @@
-From 190bf09b5260bf94f9654294887cf916aa805fa8 Mon Sep 17 00:00:00 2001
+From 7d2e54028f5558f0ccea5ecd8f5f812e28597a47 Mon Sep 17 00:00:00 2001
 From: persmule <persmule@gmail.com>
 Date: Sun, 31 Oct 2021 23:33:26 +0000
-Subject: [PATCH 02/35] lenovo/t400: Enable all SATA ports
+Subject: [PATCH 02/40] lenovo/t400: Enable all SATA ports
 
 There are 2 SATA ports on the chassis of t400(s), but at least one dock for
 t400 contains a port for (P/S)ATA device, and t400s has a eSATA port on its
@@ -30,5 +30,5 @@ index 9e056772e9..9361f330d2 100644
  			register "sata_traffic_monitor"		= "0"
  
 -- 
-2.39.5
+2.47.3