powerpc/sstep: Consistently use one define to check arch bit width

Previously, both CONFIG_PPC64 and __powerpc64__ were being used to check
whether we built a 32-bit or a 64-bit kernel, sometimes in a single
function.

I went with CONFIG_PPC64 because it’s the most used in the kernel, and
the preferred way to check whether we’re building a 64-bit kernel, not
just 64-bit code, as recommended by Christophe Leroy.

Signed-off-by: Link Mauve <linkmauve@linkmauve.fr>
Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260730065007.964703-2-linkmauve@linkmauve.fr

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