Remove config.mk for da8xxevm based boards.

Move CONFIG_SYS_TEXT_BASE to the board's config file, and remove the
now unnecessary config.mk file.

Signed-off-by: Sughosh Ganu <urwithsughosh@gmail.com>
Tested-by: Ben Gardiner <bengardiner@nanometrics.ca>
diff --git a/include/configs/da830evm.h b/include/configs/da830evm.h
index d8f1e9f..906b8e7 100644
--- a/include/configs/da830evm.h
+++ b/include/configs/da830evm.h
@@ -42,6 +42,7 @@
 #define CONFIG_SYS_HZ			1000
 #define CONFIG_SKIP_LOWLEVEL_INIT
 #define CONFIG_SKIP_RELOCATE_UBOOT	/* to a proper address, init done */
+#define CONFIG_SYS_TEXT_BASE		0xc1080000
 
 /*
  * Memory Info