Revert "msm: mdss: Detach mdss iommu on static screen"

It seems this commit creates a memory leak that causes constant redraws/reloads
 after about 18 hours of use.

This reverts commit e8f9507cd07c2bf1cb121dacab65800f631988d2.

Change-Id: Ib951ea8abb5813a5fef292a4243ae8bb00d34412
Signed-off-by: Josue Rivera <prbassplayer@gmail.com>