Re-factor (i386|amd64)mpx target descriptions.

Re-factor (i386|amd64)mpx target descriptions.

In the previous patch a new set of target descriptions
(i386|amd64)-avx-mpx were added  being same as the (i386|amd64)-mpx.
This patch removes AVX feature from  (i386|amd64)-mpx target
description set.

This way the (i386|amd64)avx_mpx(_linux|) set has AVX and MPX features
and (i386|amd64)mpx(_linux|) only MPX.

2016-04-14  Walfred Tedeschi  <walfred.tedeschi@intel.com>

	* features/i386/amd64-mpx-linux.xml: Remove AVX feature.
	* features/i386/amd64-mpx.xml: Remove AVX feature.
	* features/i386/i386-mpx-linux.xml: Remove AVX feature.
	* features/i386/i386-mpx.xml: Remove AVX feature.
	* features/i386/amd64-mpx-linux.c: Regenerate.
	* features/i386/amd64-mpx.c: Regenerate.
	* features/i386/i386-mpx-linux.c: Regenerate.
	* features/i386/i386-mpx.c: Regenerate.
	* regformats/i386/amd64-mpx-linux.dat: Regenerate.
	* regformats/i386/amd64-mpx.dat: Regenerate.
	* regformats/i386/i386-mpx-linux.dat: Regenerate.
	* regformats/i386/i386-mpx.dat: Regenerate.