iommu/riscv: Skip IRQ count check when using MSI interrupts

iommu/riscv: Skip IRQ count check when using MSI interrupts

In RISC-V IOMMU platform devices that use MSI interrupts (indicated by the
presence of 'msi-parent' in the device tree), there are no wired interrupt
lines, so calling platform_get_irq_count() returns 0 or -ENXIO, causing the
driver to fail during probe.

However, MSI interrupts are allocated dynamically via the MSI subsystem and
do not appear in the device tree 'interrupts' property. Therefore, the
driver should not require a non-zero IRQ count when 'msi-parent' is present.

This patch fixes the bug where probe fails when using MSI interrupts
 (which do not have an 'interrupts' property in the device tree)..

Fixes: <d5f88acdd6ff> ("iommu/riscv: Add support for platform msi")
Signed-off-by: Yaxing Guo <guoyaxing@bosc.ac.cn>
Reviewed-by: Andrew Jones <andrew.jones@oss.qualcomm.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>