display: Fix build with current msm mdp kernel header

Commit 999ee56abce2a0f25b3d4518a8a225fe74b3aae5 introduced a helper macro
to calculate the actual mdp revision. Use this here.

Change-Id: Ied0e0e32a4ce41acd367b81a3710c0b25559741d
Use numDisplays instead of MAX_DISPLAYS in hwcomposer reset() function

Change-Id: I98ee5f6bda680548aa0c7701e17f8a7e4e8d454c
Merge "Use numDisplays instead of MAX_DISPLAYS in hwcomposer reset() function" into cm-11.0
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_hardware_qcom_display into HEAD