Merge branch irq/fsl-mu-msi into irq/irqchip-next

* irq/fsl-mu-msi:
  : .
  : Platform MSI controller driver for the IMX MU block
  :
  : Patches from Frank Li.
  : .
  dt-bindings: irqchip: Describe the IMX MU block as a MSI controller
  irqchip: Add IMX MU MSI controller driver
  irqchip: Allow extra fields to be passed to IRQCHIP_PLATFORM_DRIVER_END
  platform-msi: Export symbol platform_msi_create_irq_domain()

Signed-off-by: Marc Zyngier <maz@kernel.org>