R3k systems have no R4k timer so there's no point in pulling code that's
going to be dead.
Signed-off-by: NMaciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6704/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>