Update to mbedOS 5.4.4

Janne Kiiskilä · Janne Kiiskilä · commit 5f27acc88541 · 2017-04-27T16:14:06.000+03:00
diff --git a/mbed-os.lib b/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#42be5c01a7f91292d5e27124ad9584236025f6ab
+https://github.com/ARMmbed/mbed-os/#ed4febefdede4e88743ca12909b7bc9a3993889a

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-https://github.com/ARMmbed/mbed-os/#42be5c01a7f91292d5e27124ad9584236025f6ab`
	`1`	`+https://github.com/ARMmbed/mbed-os/#ed4febefdede4e88743ca12909b7bc9a3993889a`