mb/prodrive/atlas: Add IBECC Kconfig option

Add an option on Atlas to enable IBECC (In Band Error Correction Code),
which is currently needed for endurance testing.

Test: start atlas mainboard with Linux. See in dmesg that
IBECC (EDAC igen6) driver is loaded. Inject a fake error via debugfs
and see in dmesg that Linux handles it.

Signed-off-by: Maximilian Brune <maximilian.brune@9elements.com>
Change-Id: I71ee2401136e2dc70b3164db6c99af03a3e1f346
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68783
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>

src/mainboard/prodrive/atlas/Kconfig

@@ -19,6 +19,13 @@ config ATLAS_ENABLE_SAGV
 	bool "Enable SaGv"
 	default y
 
+config ATLAS_ENABLE_IBECC
+	bool "Enable IBECC"
+	help
+	  Enables In Band Error Correction Code. It's only needed for endurance testing
+	  and therefore not always required.
+	default n
+
 config MAINBOARD_FAMILY
 	string
 	default "PRODRIVE_ATLAS_SERIES"

src/mainboard/prodrive/atlas/devicetree.cb

@@ -47,6 +47,9 @@ chip soc/intel/alderlake
 	register "usb3_ports[2]" = "USB3_PORT_DEFAULT(OC1)"
 	register "usb3_ports[3]" = "USB3_PORT_DEFAULT(OC1)"
 
+	register "ibecc.enable" = "CONFIG(ATLAS_ENABLE_IBECC)"
+	register "ibecc.mode" = "CONFIG(ATLAS_ENABLE_IBECC) ? IBECC_MODE_ALL : IBECC_MODE_NONE"
+
 	register "sata_salp_support" = "1"
 
 	register "sata_ports_enable" = "{