[Tizen][SysApps] Add AVCodecs support in device capabilities

The main idea is as below:
1. Get supported codec and mime format list from libffmpegsumo.so
2. Use APIs in net/base/mime_util.h to verify whether a format/codec supported.
   If true, the codec will be added in the supported media codecs list.

The step 2 logic refers to implementation of
WebKit::WebMimeRegistry::supportsMediaMIMEType()

spec: http://device-capabilities.sysapps.org/
feature: https://crosswalk-project.org/jira/browse/XWALK-47
Merge pull request #1118 from qjia7/getAVCodecs

[SysApps][Tizen] Add AVCodecs support in device capabilities