Revert "msm: mdss: disable VIG3 and RGB3 pipes for APQ8084"

Root cause of the original issue mentioned in commit 9f9e334e has been
identified and fixed. Reverting the temporary workaround.

This reverts commit 9f9e334e.

Change-Id: I1a3ac374244e071c95e27042687dae5e5839f6b9
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>