cc3200: Increase main stack size to 2K.

Increasing it from 1K to 2K gives more freedom to the callback
handlers, before this, simply nesting a function call into a
printf would cause a stack overflow.

cc3200/application.lds

@@ -24,7 +24,7 @@
  * THE SOFTWARE.
  */
 
-__stack_size__    = 1K;       /* interrupts are handled within this stack */
+__stack_size__    = 2K;       /* interrupts are handled within this stack */
 __min_heap_size__ = 8K;
 __rtos_heap_size  = 16K;