iommu/amd: Clean up function declarations

Remove unused declarations and add static keyword as needed.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20220301085626.87680-4-vasant.hegde@amd.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd/amd_iommu.h

@@ -14,10 +14,6 @@
 extern irqreturn_t amd_iommu_int_thread(int irq, void *data);
 extern irqreturn_t amd_iommu_int_handler(int irq, void *data);
 extern void amd_iommu_apply_erratum_63(u16 devid);
-extern void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu);
-extern int amd_iommu_init_devices(void);
-extern void amd_iommu_uninit_devices(void);
-extern void amd_iommu_init_notifier(void);
 extern int amd_iommu_init_api(void);
 
 #ifdef CONFIG_AMD_IOMMU_DEBUGFS

drivers/iommu/amd/init.c

@@ -661,7 +661,7 @@ static int __init alloc_command_buffer(struct amd_iommu *iommu)
  * This function resets the command buffer if the IOMMU stopped fetching
  * commands from it.
  */
-void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu)
+static void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu)
 {
 	iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);