iommu/omap: fix printk formats for dma_addr_t

Fixed the following printk format warnings for dma_addr_t
for OMAP IOMMU.

drivers/iommu/omap-iommu.c: In function 'omap_iommu_iova_to_phys':
drivers/iommu/omap-iommu.c:1238:4: warning: format '%lx' expects type 'long unsigned int', but argument 4 has type 'dma_addr_t'
drivers/iommu/omap-iommu.c:1245:4: warning: format '%lx' expects type 'long unsigned int', but argument 4 has type 'dma_addr_t'

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>