src/Kconfig: Drop unused HAVE_POSTCAR

Change-Id: Id8dcba8e83b0f896c26ab684d857908c6f272453
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36497
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/Kconfig b/src/Kconfig
index 0d7c934..793927a 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -1243,11 +1243,6 @@
 	bool
 	default y
 
-config HAVE_POSTCAR
-	bool
-	depends on POSTCAR_STAGE
-	default y
-
 config HAVE_RAMSTAGE
 	bool
 	default n if RAMPAYLOAD