msm: mdss: fix typo in exposed mdp capabilities

Fix typo in mdp capabilities that are exposed
to user space. Code was missing a new line sign,
causing two capabilities to be appended in the
same line.

Change-Id: I005c710f6dcda623b3048cb2d9d4c601a80bf3c9
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>