Update NEWS on 2.2.x

NEWS

 Changes between 2.2.1 and 2.2.2:
 --------------------------------
 
+Access:
+ * Fix SetupFormat for continuous framesize in v4l2
+
+Demux:
+ * Fix support for ms-dvr files
+ * HLS: fix hang on stop, crashes and small improvements
+ * Fix mp4 NULL dereference reported by by Fortinet's FortiGuard Labs
+
+Decoders:
+ * Fix importing surface from main memory in VDPAU
+
+Audio output:
+ * Fix audio drop after a flush with pulseaudio
+
+Skins2:
+ * Fix video control that fails to show up
+
+Misc:
+ * Fix build if one disables XCB but activate VDPAU on Unix
+ * Fix build with recent FreeRDP versions
+
 
 Changes between 2.2.0 and 2.2.1:
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