Revert "coreboot: rev 8b52167a9f 13 July 2025, rebase t480"

This reverts commit 32dfdfbb01.

The update caused an issue on T480:

Backlight comes on, then off, then on, then off, repeatedly, and
never gets to the payload. Will have to investigate further.

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

config/coreboot/default/patches/0037-Conditional-TBFW-setting-for-T480-T480S.patch

@@ -0,0 +1,37 @@
+From 3b6c8e02eba287727b3abc96ffe5612f28c27df3 Mon Sep 17 00:00:00 2001
+From: Leah Rowe <leah@libreboot.org>
+Date: Mon, 21 Apr 2025 05:14:45 +0100
+Subject: [PATCH 37/41] Conditional TBFW setting for T480/T480S
+
+Otherwise, other boards will define it, which
+might trigger the vendor download script, and
+lead to a non-zero exit.
+
+Signed-off-by: Leah Rowe <leah@libreboot.org>
+---
+ src/mainboard/lenovo/Kconfig | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/src/mainboard/lenovo/Kconfig b/src/mainboard/lenovo/Kconfig
+index 512b326381..3d3490b35d 100644
+--- a/src/mainboard/lenovo/Kconfig
++++ b/src/mainboard/lenovo/Kconfig
+@@ -18,6 +18,8 @@ config MAINBOARD_FAMILY
+ 	string
+ 	default MAINBOARD_PART_NUMBER
+ 
++if BOARD_LENOVO_T480 || BOARD_LENOVO_T480S
++
+ config LENOVO_TBFW_BIN
+ 	string "Lenovo ThunderBolt firmware bin file"
+ 	default ""
+@@ -44,4 +46,6 @@ config LENOVO_TBFW_BIN
+ 	  Just leave this blank if you don't care about this option. It's not
+ 	  useful for every ThinkPad, only certain models.
+ 
++endif # BOARD LENOVO_T480 || BOARD_LENOVO_T480S
++
+ endif # VENDOR_LENOVO
+-- 
+2.39.5
+