MLECO-3071: Reducing stack sizes

After evaluating stack sizes (after HAL refactoring) we can
safely reduce the stack allocation for all the applications.

Change-Id: I7d9cd4edd28753fe3f8a668d8c557c2788f4c823
Signed-off-by: Kshitij Sisodia <kshitij.sisodia@arm.com>
diff --git a/scripts/cmake/platforms/simple_platform/simple_platform.ld b/scripts/cmake/platforms/simple_platform/simple_platform.ld
index 82cb18e..7f1c9c2 100644
--- a/scripts/cmake/platforms/simple_platform/simple_platform.ld
+++ b/scripts/cmake/platforms/simple_platform/simple_platform.ld
@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 
-__STACK_SIZE = 0x00060000;
+__STACK_SIZE = 0x00008000;
 __HEAP_SIZE  = 0x000C0000;
 
 /* System memory brief */