iommu: make inclusion of amd directory conditional

Nothing in there is active if CONFIG_AMD_IOMMU is not enabled, so the whole
directory can depend on that switch as well.

Fixes: cbe94c6 ("iommu/amd: Move Kconfig and Makefile bits down into amd directory")
Signed-off-by: Rolf Eike Beer <eb@emlix.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/1894970.atdPhlSkOF@devpool92.emlix.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: DerDakon

drivers/iommu/Makefile

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
-obj-y += amd/ arm/ iommufd/ riscv/
+obj-y += arm/ iommufd/ riscv/
+obj-$(CONFIG_AMD_IOMMU) += amd/
 obj-$(CONFIG_INTEL_IOMMU) += intel/
 obj-$(CONFIG_IOMMU_API) += iommu.o
 obj-$(CONFIG_IOMMU_SUPPORT) += iommu-pages.o

drivers/iommu/amd/Makefile

@@ -1,3 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0-only
-obj-$(CONFIG_AMD_IOMMU) += iommu.o init.o quirks.o io_pgtable.o io_pgtable_v2.o ppr.o pasid.o
+obj-y += iommu.o init.o quirks.o io_pgtable.o io_pgtable_v2.o ppr.o pasid.o
 obj-$(CONFIG_AMD_IOMMU_DEBUGFS) += debugfs.o