iommu/riscv: Add missing GENERIC_MSI_IRQ

The commit below added MSI related calls to the driver that depends on
GENERIC_MSI_IRQ. It is possible to build RISC-V without this selected.

This is also necessary to make the driver COMPILE_TEST.

Fixes: d5f88ac ("iommu/riscv: Add support for platform msi")
Tested-by: Vincent Chen <vincent.chen@sifive.com>
Tested-by: Tomasz Jeznach <tjeznach@rivosinc.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

Author: jgunthorpe

drivers/iommu/riscv/Kconfig

@@ -4,6 +4,7 @@
 config RISCV_IOMMU
 	bool "RISC-V IOMMU Support"
 	depends on RISCV && 64BIT
+	depends on GENERIC_MSI_IRQ
 	default y
 	select IOMMU_API
 	select GENERIC_PT