MIPS: cpu-probe: Remove cp0 hazard barrier when enabling the FTLB

We are so early in the boot process where we really don't want to
stall and wait for CP0 FTLB related changes become visible so just drop
the cp0 hazard barrier.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10649/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>