msm: mdss: Document mdss driver parameters
msm: mdss: Document mdss driver parameters

mdss driver parameters, visible to userland, are documented,
giving out short descriptions of their role.

Change-Id: I34bfe0152c7f7629c18a968a474ab0a3369560fa
Signed-off-by: Adrian Salido-Moreno <f4561ccbe90a02dadc9d168b29bfea0c1b57222c@codeaurora.org>
Signed-off-by: Mayank Chopra <28c38a3581118b3d352644a239d77c63a14119d4@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas