iommu/amd: Fix compilation error

With WERROR=y, which is default, clang is not happy:

.../amd/pasid.c:168:3: error: call to undeclared function 'mmu_notifier_unregister'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
.../amd/pasid.c:191:8: error: call to undeclared function 'mmu_notifier_register'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
2 errors generated.

Select missed dependency.

Fixes: a5a91e54 ("iommu/amd: Add SVA domain support")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20240429111707.2795194-1-andriy.shevchenko@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd/Kconfig

@@ -7,6 +7,7 @@ config AMD_IOMMU
 	select PCI_ATS
 	select PCI_PRI
 	select PCI_PASID
+	select MMU_NOTIFIER
 	select IOMMU_API
 	select IOMMU_IOVA
 	select IOMMU_IO_PGTABLE