defconfig: msm: Enable MSM_IOMMU_V1 on msmtitanium

SMMU are enabled through MSM_IOMMU_V1 config. Correct
the config which was being enabled for 32 bit
msmtitanium target.

Change-Id: Ifc9a19b8881fed8974728bd096766c27fa31f80e
Signed-off-by: Susheel Khiani <skhiani@codeaurora.org>