drivers/wifi/generic: Fix a typo on symbol

WIFI_MTCL_CBFS_FILEPATH is now used.

Change-Id: Icdd0332ae9c56a54596a775c0a9aa7b9f8d6738c
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81974
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
diff --git a/src/drivers/wifi/generic/Makefile.mk b/src/drivers/wifi/generic/Makefile.mk
index 2231115..4ccc934 100644
--- a/src/drivers/wifi/generic/Makefile.mk
+++ b/src/drivers/wifi/generic/Makefile.mk
@@ -20,12 +20,12 @@
 
 endif
 
-CONFIG_MTCL_CBFS_FILEPATH := $(call strip_quotes,$(CONFIG_MTCL_CBFS_FILEPATH))
+CONFIG_WIFI_MTCL_CBFS_FILEPATH := $(call strip_quotes,$(CONFIG_WIFI_MTCL_CBFS_FILEPATH))
 
-ifneq ($(CONFIG_MTCL_CBFS_FILEPATH),)
+ifneq ($(CONFIG_WIFI_MTCL_CBFS_FILEPATH),)
 
 cbfs-files-$(CONFIG_USE_MTCL) += wifi_mtcl.bin
-wifi_mtcl.bin-file := $(CONFIG_MTCL_CBFS_FILEPATH)
+wifi_mtcl.bin-file := $(CONFIG_WIFI_MTCL_CBFS_FILEPATH)
 wifi_mtcl.bin-type := raw
 
 endif