MIPS: kconfig: add options for vct board variant select

The vct board can be built with various variants which are
configured via CONFIG_SYS_EXTRA_OPTIONS. This is deprecated. Thus
add new Kconfig options for those board variants.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Acked-by: Stefan Roese <sr@denx.de>
diff --git a/board/micronas/vct/Kconfig b/board/micronas/vct/Kconfig
index 7c69453..288a1ae 100644
--- a/board/micronas/vct/Kconfig
+++ b/board/micronas/vct/Kconfig
@@ -9,4 +9,28 @@
 config SYS_CONFIG_NAME
 	default "vct"
 
+menu "vct board options"
+
+choice
+	prompt "Board variant"
+
+config VCT_PLATINUM
+	bool "Enable VCT_PLATINUM"
+
+config VCT_PLATINUMAVC
+	bool "Enable VCT_PLATINUMAVC"
+
+config VCT_PREMIUM
+	bool "Enable VCT_PLATINUMAVC"
+
+endchoice
+
+config VCT_ONENAND
+	bool "Enable VCT_ONENAND"
+
+config VCT_SMALL_IMAGE
+	bool "Enable VCT_SMALL_IMAGE"
+
+endmenu
+
 endif