ARM: tegra: rename colibri_t20 board/configuration/device-tree

In accordance with our other modules supported by U-Boot and as agreed
upon for Apalis/Colibri T30 get rid of the carrier board in the board/
configuration/device-tree naming.

While at it also bring the prompt more in line with our other products.

Signed-off-by: Marcel Ziswiler <marcel@ziswiler.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/board/toradex/colibri_t20/Kconfig b/board/toradex/colibri_t20/Kconfig
new file mode 100644
index 0000000..7f373b2
--- /dev/null
+++ b/board/toradex/colibri_t20/Kconfig
@@ -0,0 +1,12 @@
+if TARGET_COLIBRI_T20
+
+config SYS_BOARD
+	default "colibri_t20"
+
+config SYS_VENDOR
+	default "toradex"
+
+config SYS_CONFIG_NAME
+	default "colibri_t20"
+
+endif