Add supporting to V4L2_PIX_FMT_JPEG since it works same as MJPEG.
Add supporting to V4L2_PIX_FMT_JPEG since it works same as MJPEG.

ISSUE=529
TEST=unittest
Review URL: https://webrtc-codereview.appspot.com/1120006

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 6b6eb44cca941838dba9ad6b6ff1983c829d5664

sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc