[PATCH 4/9 v2] powerpc: msi: Extend the msi region interface to get info from fsl_msi

The FSL MSI will provide the interface to get: - Number of MSI regions (which is number of MSI banks for powerpc) - Get the region address range: Physical page which have the address/addresses used for generating MSI interrupt and size of the page. These are required to create IOMMU

[PATCH 4/9 v2] powerpc: msi: Extend the msi region interface to get info from fsl_msi

The FSL MSI will provide the interface to get: - Number of MSI regions (which is number of MSI banks for powerpc) - Get the region address range: Physical page which have the address/addresses used for generating MSI interrupt and size of the page. These are required to create IOMMU