Fix mixed up PPC_FEATURE_* values related to VSX.

REALLY DID remove redundant mathinline.h this time.

commit 2123d581
Author: Andreas Schwab <aschwab@redhat.com>
Date:   Sun Jul 5 23:46:03 2009 -0700

Fix wrong PPC_FEATURE_* values.

Nothing uses these wrong values yet, but it fixes a warning due to
conflicting definitions in <asm/cputable.h>.