msdk: relicense the plugin to LGPL

Some files licensed under LGPL were included, so relicense the plugin
from BSD to LPGL. In addition, this patch removes the README per the
discussion in gstreamer/gst-plugins-bad#853

Fixes gstreamer/gst-plugins-bad#853

sys/msdk/README

-
-# gst-msdk
-
-gst-msdk is a plugin for
-[Intel Media SDK](https://software.intel.com/en-us/media-sdk), a
-cross-platform API for developing media applications. The plugin has
-multiple elements for video hardware encoding leveraging latest Intel
-processors through Intel Media SDK.
-
-- MPEG2 encoding (*msdkmpeg2enc*)
-
-- H.264 encoding (*msdkh264enc*)
-
-- H.265 encoding (*msdkh265enc*)
-
-- VP8 encoding (*msdkvp8enc*)
-
-
-It requires:
-
-- Intel Media SDK
-
-
-# Giving it a try
-
-Encoding a simple video test source and saving it to a file.
-
-    $ gst-launch-1.0 videotestsrc ! msdkh264enc ! filesink location=test.h264
-
-
-# License
-
-gst-mdk is freely available for download under the terms of the
-[BSD-3-Clause License](https://spdx.org/licenses/BSD-3-Clause.html).

sys/msdk/gstmsdk.c

@@ -149,4 +149,4 @@ GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
     GST_VERSION_MINOR,
     msdk,
     "Intel Media SDK based elements",
-    plugin_init, VERSION, "BSD", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
+    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)