powerpc: Create a powerpc64 config feature

The config symbol TARGET_ps3 is used in the build files where
special handling for the 64 bit PowerPC processors is needed.
Introduce a new config feature powerpc64, and replace the use
of TARGET_ps3 with powerpc64.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>

SVN-Revision: 17306

scripts/metadata.pl

@@ -165,6 +165,7 @@ sub target_config_features(@) {
 		/cpiogz/ and $ret .= "\tselect USES_CPIOGZ\n";
 		/fpu/ and $ret .= "\tselect HAS_FPU\n";
 		/ramdisk/ and $ret .= "\tselect USES_INITRAMFS\n";
+		/powerpc64/ and $ret .= "\tselect powerpc64\n";
 	}
 	return $ret;
 }