linux-imx

arm64: lsdk.config: Enable IOMMU passthrough by default

Since Linux v4.19 the new kernel configure option has been added to
enable the IOMMU passthrough by default.  We have been enabling the
passthrough for LSDK in kernel parameter.  Enabling this in kernel
configure will make kernel parameter optional.

Signed-off-by: Li Yang <leoyang.li@nxp.com>