sparc64: Fix prototype warnings in adi_64.c

Fix the following warnings:
arch/sparc/kernel/adi_64.c:124:21: warning: no previous prototype for ‘find_tag_store’
arch/sparc/kernel/adi_64.c:156:21: warning: no previous prototype for ‘alloc_tag_store’
arch/sparc/kernel/adi_64.c:299:6: warning: no previous prototype for ‘del_tag_store’

None of the functions were used outside the file, so declare them static.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: David S. Miller <davem@davemloft.net>
Reviewed-by: Andreas Larsson <andreas@gaisler.com>
Tested-by: Andreas Larsson <andreas@gaisler.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20240330-sparc64-warnings-v1-7-37201023ee2f@ravnborg.orgSigned-off-by: Andreas Larsson <andreas@gaisler.com>

arch/sparc/kernel/adi_64.c

@@ -121,9 +121,9 @@ void __init mdesc_adi_init(void)
 		mdesc_release(hp);
 }
 
-tag_storage_desc_t *find_tag_store(struct mm_struct *mm,
-				   struct vm_area_struct *vma,
-				   unsigned long addr)
+static tag_storage_desc_t *find_tag_store(struct mm_struct *mm,
+					  struct vm_area_struct *vma,
+					  unsigned long addr)
 {
 	tag_storage_desc_t *tag_desc = NULL;
 	unsigned long i, max_desc, flags;
@@ -153,9 +153,9 @@ tag_storage_desc_t *find_tag_store(struct mm_struct *mm,
 	return tag_desc;
 }
 
-tag_storage_desc_t *alloc_tag_store(struct mm_struct *mm,
-				    struct vm_area_struct *vma,
-				    unsigned long addr)
+static tag_storage_desc_t *alloc_tag_store(struct mm_struct *mm,
+					   struct vm_area_struct *vma,
+					   unsigned long addr)
 {
 	unsigned char *tags;
 	unsigned long i, size, max_desc, flags;
@@ -296,7 +296,7 @@ tag_storage_desc_t *alloc_tag_store(struct mm_struct *mm,
 	return tag_desc;
 }
 
-void del_tag_store(tag_storage_desc_t *tag_desc, struct mm_struct *mm)
+static void del_tag_store(tag_storage_desc_t *tag_desc, struct mm_struct *mm)
 {
 	unsigned long flags;
 	unsigned char *tags = NULL;