powerpc/sparse: Make a bunch of things static
Squash a bunch of sparse warnings by making things static. Reviewed-by: NAndrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: NDaniel Axtens <dja@axtens.net> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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