powerpc: restore removed #endif

Fixes: 70010521 ("Merge tag 'x86_core_for_5.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip"

)
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Brown-paper-bag-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>