[imxrt1050xxx] update imxrt template to support scons --dist

bsp/imxrt/libraries/templates/imxrt1050xxx/rtconfig.py

@@ -147,3 +147,10 @@ elif PLATFORM == 'iar':
 
     EXEC_PATH = EXEC_PATH + '/arm/bin/'
     POST_ACTION = 'ielftool --bin $TARGET rtthread.bin'
+
+def dist_handle(BSP_ROOT, dist_dir):
+    import sys
+    cwd_path = os.getcwd()
+    sys.path.append(os.path.join(os.path.dirname(BSP_ROOT), 'tools'))
+    from sdk_dist import dist_do_building
+    dist_do_building(BSP_ROOT, dist_dir