add memory_mode_auto config to exosphere.ini template

config_templates/exosphere.ini

@@ -46,6 +46,10 @@
 # Key: log_inverted, default: 0.
 #  Desc: Controls whether the logging uart port is inverted.
 
+# Key: memory_mode_auto, default: 0.
+#  Desc: Control how the memory mode is determined
+#  NOTE: 1: Set memory mode according to physical memory/dram id, 0: 
+
 [exosphere]
 debugmode=1
 debugmode_user=0