selftests: vDSO: parse_vdso: Drop vdso_init_from_auxv()

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This also removes the usage of ElfXX_auxv_t, which is not formally
standardized.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/all/20250226-parse_vdso-nolibc-v2-11-28e14e031ed8@linutronix.de

Author: t-8ch

tools/testing/selftests/vDSO/parse_vdso.c

@@ -297,17 +297,3 @@ void *vdso_sym(const char *version, const char *name)
 
 	return 0;
 }
-
-void vdso_init_from_auxv(void *auxv)
-{
-	ELF(auxv_t) *elf_auxv = auxv;
-	for (int i = 0; elf_auxv[i].a_type != AT_NULL; i++)
-	{
-		if (elf_auxv[i].a_type == AT_SYSINFO_EHDR) {
-			vdso_init_from_sysinfo_ehdr(elf_auxv[i].a_un.a_val);
-			return;
-		}
-	}
-
-	vdso_info.valid = false;
-}

tools/testing/selftests/vDSO/parse_vdso.h

@@ -26,6 +26,5 @@
  */
 void *vdso_sym(const char *version, const char *name);
 void vdso_init_from_sysinfo_ehdr(uintptr_t base);
-void vdso_init_from_auxv(void *auxv);
 
 #endif