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

The main idea is as follows:
1. Get ffmpeg supported codec list and format list.
2. Use 1's result as the input. Utilize the APIs IsSupportedMediaMimeType,
IsSupportedStrictMediaMimeType in src/net/base/mime_util.h to iterate 1's
codec list and format list to check if the current codec is supported.
If true, the codec will be added in the supported media codecs list.
The checking logic will refer WebMimeRegistry’s supportsMediaMIMEType function.

spec: http://device-capabilities.sysapps.org/
feature: https://crosswalk-project.org/jira/browse/XWALK-47