commit 6d7f58b0 ("[PATCH] powerpc: Some minor cleanups to setup_32.c")
removed of_show_percpuinfo but didn't remove the prototype.

Remove it.

Fixes: 6d7f58b0 ("[PATCH] powerpc: Some minor cleanups to setup_32.c")
Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210903063246.70691-1-dja@axtens.net