Revert "Update atmel-rf-driver"

sg- · web-flow · commit e943b37ac74f · 2016-06-11T13:53:48.000+01:00
diff --git a/net/atmel-rf-driver.lib b/net/atmel-rf-driver.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/atmel-rf-driver/#81c30c484735533a904c4d04f69d0dcb30468612
+https://github.com/ARMmbed/atmel-rf-driver/#6c13f90859761df04188730aba9a9953b25179a6

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-https://github.com/ARMmbed/atmel-rf-driver/#81c30c484735533a904c4d04f69d0dcb30468612`
	`1`	`+https://github.com/ARMmbed/atmel-rf-driver/#6c13f90859761df04188730aba9a9953b25179a6`