defconfig: msm: iommu: Enable VBIF check for msm8974, msm8226, and apq8084

The VBIF check will help debugging issues related to IOMMU TLB sync, IOMMU
halt, and VBIF issues. With this option enabled when an issue occurs the
kernel log will contain debugging information.

Change-Id: I7c170743d3456532849358857cad454a62534da2
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>