ARM: OMAP2+: plug in device_enable/idle ops for IOMMUs

The OMAP IOMMU driver requires the device_enable/idle platform
data ops on all the IOMMU devices to be able to enable and disable
the clocks. Plug in these pdata ops for all the existing IOMMUs,
both for non-DT devices, and for DT-devices through pdata quirks.

Signed-off-by: Suman Anna <s-anna@ti.com>