soc/intel/alderlake/acpi: Add Kconfig options for SCM and FCM

Software Connection Manager doesn't work with Linux 5.13 or later,
resulting in TBT ports timing out. Not advertising this results
in Firmware Connection Manager being used and TBT works
correctly.

Add Kconfig options to chose between SCM (Software Connection
Manager) and FCM (Firmware Connection Manager). FCM is primary, as
it's more compatible save for ChromeOS devices as ChromeOS uses
SCM.

Linux patch:
torvalds/linux@c6da62a
c6da62a219d028de10f2e22e93a34c7ee2b88d03

Tested with StarBook Mk VI (i7-1260P).

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: Iac31d37c0873f41f7b14e1051fe214466d1ebdd8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64561
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Martin L Roth <gaumless@gmail.com>

src/device/Kconfig

@@ -726,6 +726,30 @@ endif # PCIEXP_HOTPLUG
 
 endif # PCIEXP_PLUGIN_SUPPORT
 
+choice
+	prompt "Connection Manager"
+	default FIRMWARE_CONNECTION_MANAGER
+	help
+	  Software Connection Manager doesn't work with Linux 5.13 or later,
+	  resulting in TBT ports timing out. Firmware Connection Manager works
+	  correctly.
+
+	  Linux patch:
+	    torvalds/linux@c6da62a
+	    c6da62a219d028de10f2e22e93a34c7ee2b88d03
+
+config FIRMWARE_CONNECTION_MANAGER
+	bool "Firmware Connection Manager"
+	help
+	  Disable SCM so that FCM can be used
+
+config SOFTWARE_CONNECTION_MANAGER
+	bool "Software Connection Manager"
+	help
+	  Enable SCM so it's used instead of FCM.
+
+endchoice
+
 config EARLY_PCI_BRIDGE
 	bool "Early PCI bridge"
 	depends on PCI