mb/lippert: Put files under variants/

This isn't reproducible for some reason, but it is relatively simple.

Change-Id: I507229be71ac2c589c7ecd81495d38ce363d26a7
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43275
Reviewed-by: Michael Niewöhner
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/lippert/frontrunner-af/Kconfig

@@ -32,8 +32,7 @@ config VARIANT_DIR
 
 config DEVICETREE
 	string
-	default "devicetree-fr.cb" if BOARD_LIPPERT_FRONTRUNNER_AF
-	default "devicetree-tc.cb" if BOARD_LIPPERT_TOUCAN_AF
+	default "variants/\$(CONFIG_VARIANT_DIR)/devicetree.cb"
 
 config MAINBOARD_PART_NUMBER
 	string

src/mainboard/lippert/frontrunner-af/Makefile.inc

@@ -7,31 +7,16 @@ pci$(stripped_ahcibios_id).rom-file := $(call strip_quotes,$(CONFIG_AHCI_BIOS_FI
 pci$(stripped_ahcibios_id).rom-type := optionrom
 endif
 
-ifeq ($(CONFIG_BOARD_LIPPERT_FRONTRUNNER_AF),y)
-bootblock-y += bootblock-fr.c
-else ifeq ($(CONFIG_BOARD_LIPPERT_TOUCAN_AF),y)
-bootblock-y += bootblock-tc.c
-endif
+bootblock-y += variants/$(VARIANT_DIR)/bootblock.c
 
 romstage-y += buildOpts.c
-ifeq ($(CONFIG_BOARD_LIPPERT_FRONTRUNNER_AF),y)
-romstage-y += BiosCallOuts-fr.c
-romstage-y += OemCustomize-fr.c
-else ifeq ($(CONFIG_BOARD_LIPPERT_TOUCAN_AF),y)
-romstage-y += BiosCallOuts-tc.c
-romstage-y += OemCustomize-tc.c
-endif
+romstage-y += variants/$(VARIANT_DIR)/BiosCallOuts.c
+romstage-y += variants/$(VARIANT_DIR)/OemCustomize.c
 
 ramstage-y += buildOpts.c
-ifeq ($(CONFIG_BOARD_LIPPERT_FRONTRUNNER_AF),y)
-ramstage-y += BiosCallOuts-fr.c
-ramstage-y += OemCustomize-fr.c
-ramstage-y += mainboard-fr.c
-else ifeq ($(CONFIG_BOARD_LIPPERT_TOUCAN_AF),y)
-ramstage-y += BiosCallOuts-tc.c
-ramstage-y += OemCustomize-tc.c
-ramstage-y += mainboard-tc.c
-endif
+ramstage-y += variants/$(VARIANT_DIR)/BiosCallOuts.c
+ramstage-y += variants/$(VARIANT_DIR)/OemCustomize.c
+ramstage-y += variants/$(VARIANT_DIR)/mainboard.c
 
 # Minimal SEMA watchdog support
 romstage-y += sema.c