board: tbs2910: add private imx config

Add board specific imx config file with recommended IPU Qos settings
and adapted DDR configuration.

Signed-off-by: Soeren Moch <smoch@web.de>
diff --git a/board/tbs/tbs2910/Kconfig b/board/tbs/tbs2910/Kconfig
index 55c475c..2e5e1d4 100644
--- a/board/tbs/tbs2910/Kconfig
+++ b/board/tbs/tbs2910/Kconfig
@@ -13,6 +13,6 @@
 	default y
 
 config IMX_CONFIG
-	default "board/boundary/nitrogen6x/nitrogen6q2g.cfg"
+	default "board/tbs/tbs2910/tbs2910.cfg"
 
 endif