defconfig: msm: Add configuration for MDP3

Currently MDP3 display controller driver is compiled for all targets
regardless controller in HW is present or not. Fix this by adding a
config flag on targets where needed only.

Change-Id: I6646efef31c860e16efe4374deb058ac519e5fc3
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>