Add custom VFS reader from micropython/extmod & Patch micropython

EcmaXp · EcmaXp · commit bf56a4e5e11e · 2018-10-18T22:23:45.000+09:00
diff --git a/micropython b/micropython
@@ -1 +1 @@
-Subproject commit d118e8d1d772082808596f44ef3aa6fde40af98c
+Subproject commit 8921adde620b3d93442269bf103f4b705a5a3129

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-Subproject commit d118e8d1d772082808596f44ef3aa6fde40af98c`
	`1`	`+Subproject commit 8921adde620b3d93442269bf103f4b705a5a3129`