linux-imx

vfio/fsl-mc: Added lock support in preparation for interrupt handling

All the devices in a DPRC share the same pool of interrupts.
Because of this the access to the pool of interrupts must be
protected with a lock. Extend the current lock implementation
to have a lock per DPRC.

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