siemens,am33x,thuban: rename dxr2 to thuban

Update new naming scheme.

Signed-off-by: Samuel Egli <samuel.egli@siemens.com>
Acked-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/thuban_defconfig b/configs/thuban_defconfig
new file mode 100644
index 0000000..5fab571
--- /dev/null
+++ b/configs/thuban_defconfig
@@ -0,0 +1,7 @@
+CONFIG_ARM=y
+CONFIG_TARGET_THUBAN=y
+CONFIG_CMD_NET=y
+CONFIG_SPL=y
+CONFIG_AUTOBOOT_KEYED=y
+CONFIG_AUTOBOOT_PROMPT="Autobooting in %d seconds, press \"<Esc><Esc>\" to stop\n"
+CONFIG_AUTOBOOT_STOP_STR="\x1b\x1b"