powerpc: Remove extra zeros from 32 bit CPU features definitions

These are 32 bit, so no need to have a bunch of wasted 0s.

The 0s saved here can be put to better use elsewhere, like at the end of my pay
check.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>