x86/mm/mmap: Remove arch_vma_name()

This function does not contain any logic, delete it so the equivalent
weak definition from kernel/signal.c is used instead.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-10-b64f0842d512@linutronix.de

Author: t-8ch

arch/x86/mm/mmap.c

@@ -163,11 +163,6 @@ unsigned long get_mmap_base(int is_legacy)
 	return is_legacy ? mm->mmap_legacy_base : mm->mmap_base;
 }
 
-const char *arch_vma_name(struct vm_area_struct *vma)
-{
-	return NULL;
-}
-
 /**
  * mmap_address_hint_valid - Validate the address hint of mmap
  * @addr:	Address hint