Kconfig: Escape variable to accommodate new Kconfig versions

Kconfig 4.17 started using the $(..) syntax for environment variable
expansion while we want to keep expansion to the build system.
Older Kconfig versions (like ours) simply drop the escapes, not
changing the behavior.

While we could let Kconfig expand some of the variables, that only
splits the handling in two places, making debugging harder and
potentially messing with reproducible builds (e.g. when paths end up
in configs), so escape them all.

Change-Id: Ibc4087fdd76089352bd8dd0edb1351ec79ea4faa
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42481
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Frans Hendriks <fhendriks@eltan.com>
Reviewed-by: Wim Vervoorn <wvervoorn@eltan.com>
diff --git a/src/mainboard/gigabyte/ga-945gcm-s2l/Kconfig b/src/mainboard/gigabyte/ga-945gcm-s2l/Kconfig
index 8709083..9a8bf5b 100644
--- a/src/mainboard/gigabyte/ga-945gcm-s2l/Kconfig
+++ b/src/mainboard/gigabyte/ga-945gcm-s2l/Kconfig
@@ -43,6 +43,6 @@
 
 # Override the default variant behavior, since the data.vbt is the same
 config INTEL_GMA_VBT_FILE
-	default "src/mainboard/$(MAINBOARDDIR)/data.vbt"
+	default "src/mainboard/\$(MAINBOARDDIR)/data.vbt"
 
 endif
diff --git a/src/mainboard/gigabyte/ga-b75m-d3h/Kconfig b/src/mainboard/gigabyte/ga-b75m-d3h/Kconfig
index 4eda267..6edbe01 100644
--- a/src/mainboard/gigabyte/ga-b75m-d3h/Kconfig
+++ b/src/mainboard/gigabyte/ga-b75m-d3h/Kconfig
@@ -43,11 +43,11 @@
 
 config OVERRIDE_DEVICETREE
 	string
-	default "variants/$(CONFIG_VARIANT_DIR)/overridetree.cb" if BOARD_GIGABYTE_GA_B75_D3V
+	default "variants/\$(CONFIG_VARIANT_DIR)/overridetree.cb" if BOARD_GIGABYTE_GA_B75_D3V
 
 # Override the default variant behavior, since the data.vbt is the same
 config INTEL_GMA_VBT_FILE
 	string
-	default "src/mainboard/$(MAINBOARDDIR)/data.vbt"
+	default "src/mainboard/\$(MAINBOARDDIR)/data.vbt"
 
 endif # BOARD_GIGABYTE_GA_B75*
diff --git a/src/mainboard/gigabyte/ga-h61m-series/Kconfig b/src/mainboard/gigabyte/ga-h61m-series/Kconfig
index 60d516b..cfbed99 100644
--- a/src/mainboard/gigabyte/ga-h61m-series/Kconfig
+++ b/src/mainboard/gigabyte/ga-h61m-series/Kconfig
@@ -36,11 +36,11 @@
 
 config OVERRIDE_DEVICETREE
 	string
-	default "variants/$(CONFIG_VARIANT_DIR)/overridetree.cb"
+	default "variants/\$(CONFIG_VARIANT_DIR)/overridetree.cb"
 
 # Override the default variant behavior, since the data.vbt is the same
 config INTEL_GMA_VBT_FILE
-	default "src/mainboard/$(MAINBOARDDIR)/data.vbt"
+	default "src/mainboard/\$(MAINBOARDDIR)/data.vbt"
 
 config USBDEBUG_HCD_INDEX # Bottom left port seen from rear
 	int