x86: mark x86_64 as having a working WP.

Select X86_WP_WORKS_OK for x86_64 too.
Signed-off-by: NGlauber Costa <gcosta@redhat.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/Kconfig.cpu

@@ -344,7 +344,7 @@ config X86_F00F_BUG
 
 config X86_WP_WORKS_OK
 	def_bool y
-	depends on X86_32 && !M386
+	depends on !M386
 
 config X86_INVLPG
 	def_bool y