tbs2910: add thermal support

Signed-off-by: Soeren Moch <smoch@web.de>
diff --git a/configs/tbs2910_defconfig b/configs/tbs2910_defconfig
index 3e720a7..ed9c70f 100644
--- a/configs/tbs2910_defconfig
+++ b/configs/tbs2910_defconfig
@@ -3,3 +3,5 @@
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/boundary/nitrogen6x/nitrogen6q2g.cfg,MX6Q"
 CONFIG_CMD_SETEXPR=y
 CONFIG_CMD_NET=y
+CONFIG_DM=y
+CONFIG_DM_THERMAL=y