staging: tidspbridge - update Kconfig to select IOMMU module

IOMMU module most be selected when using tidspbridge, because
now tidsbridge depends on iommu module.

Signed-off-by: Fernando Guzman Lugo <x0095840@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/tidspbridge/Kconfig

@@ -6,6 +6,7 @@ menuconfig TIDSPBRIDGE
 	tristate "DSP Bridge driver"
 	depends on ARCH_OMAP3
 	select OMAP_MBOX_FWK
+	select OMAP_IOMMU
 	help
 	  DSP/BIOS Bridge is designed for platforms that contain a GPP and
 	  one or more attached DSPs.  The GPP is considered the master or