powerpc/vdso32: Fix use of crtsavres for PPC64

crtsavres.S content is encloded by a #ifndef CONFIG_PPC64

To be used on VDSO32 on PPC64 it's content must available on PPC64 as
well.

Replace #ifndef CONFIG_PPC64 by #ifndef __powerpc64__ as __powerpc64__
is not set when building VDSO32 on PPC64.

Reported-by: Christian Zigotzky <[email protected]>
Closes: https://lore.kernel.org/linuxppc-dev/[email protected]/T/
Fixes: b163596 ("powerpc/vdso32: Add crtsavres")
Signed-off-by: Christophe Leroy <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://msgid.link/aded2b257018fe654db759fdfa4ab1a0b5426b1b.1726772140.git.christophe.leroy@csgroup.eu

Author: chleroy

arch/powerpc/lib/crtsavres.S

@@ -46,7 +46,7 @@
 
 	.section ".text"
 
-#ifndef CONFIG_PPC64
+#ifndef __powerpc64__
 
 /* Routines for saving integer registers, called by the compiler.  */
 /* Called with r11 pointing to the stack header word of the caller of the */