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: NAdam Ford <aford173@gmail.com>

board/davinci/da8xxevm/Kconfig

@@ -33,8 +33,6 @@ config MAC_ADDR_IN_EEPROM
 
 endif
 
-source "board/ti/common/Kconfig"
-
 endif
 
 if TARGET_OMAPL138_LCDK