ARM: davinci: Remove duplicated references

The Kconfig file calls to ti/common/Kconfig twice which makes
several of the menu items repeat themselves.  In an effort to
clean this up, this patch removes the second call which eliminates
the duplicate menu items.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/board/davinci/da8xxevm/Kconfig b/board/davinci/da8xxevm/Kconfig
index e0df97c..bb1188b 100644
--- a/board/davinci/da8xxevm/Kconfig
+++ b/board/davinci/da8xxevm/Kconfig
@@ -33,8 +33,6 @@
 
 endif
 
-source "board/ti/common/Kconfig"
-
 endif
 
 if TARGET_OMAPL138_LCDK