MIPS: Netlogic: Remove workarounds for early SoCs

The XLPs in production do not need these workarounds. Remove the code and
the associated ifdef.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5430/


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