manifest: Track display-mdss and system_media

Fork from https://github.com/rohanmathur/hardware_qcom_display-mdss
and
https://github.com/rohanmathur/system_media

Change-Id: Iaff669b4e6cc6dff1c20e4ba28485033b49b7690
Signed-off-by: Rohan Mathur <rohanmathur34@gmail.com>
Merge "manifest: Track display-mdss and system_media" into kitkat