msm: camera: Camera IRQ router changes

Camera IRQ router changes for 8974
1) Add device tree match struct for camirq_router driver.
This is required for 8974 since platform device node is
added in device tree.
2) Probe camera IRQ router before other modules by
changing probe order. This is required since irq router
needs to register irq information with cam server before
other modules update its irq information
3) Assign proper cam_irq_hw for ISPIF during register
subdev. Otherwise, cam_irq_hw will be used uninitialised.

Change-Id: Ida29abb91264a178d45d000fe78c9555b55c0fe3
Signed-off-by: Sreesudhan Ramakrish Ramkumar <srramku@codeaurora.org>