linux-imx

vfio/fsl-mc: trigger an interrupt via eventfd

This patch allows to set an eventfd for fsl-mc device interrupt
and also to trigger the interrupt eventfd from userspace for testing.

All fsl-mc device interrupts are MSI type. This does not yet handle
correctly DPRC container interrupt where re-scanning on container is
required.

Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
Signed-off-by: Diana Craciun <diana.craciun@nxp.com>