Group additional DTS encodings under the surround sound settings

DTS-MA is controlled by the DTS-HD setting.
DTS-UHD P1 and DTS-UHD P2 are under the DTS-UHD (aka DTS:X) setting.

Added also MEDIA_MIMETYPE_AUDIO_DTS_HD_MA, MEDIA_MIMETYPE_AUDIO_DTS_UHD_P1 and MEDIA_MIMETYPE_AUDIO_DTS_UHD_P2 to the MediaDefs.

Bug: 235469058
Change-Id: I10d46a4679ee81564b6e66ef8716827452078400
Test: N/A