MIPS: BCM47XX: Add new file for device specific workarounds

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: Hauke Mehrtens <hauke@hauke-m.de>
Patchwork: https://patchwork.linux-mips.org/patch/6627/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --cc arch/mips/bcm47xx/Makefile
Simple merge

diff --cc arch/mips/bcm47xx/bcm47xx_private.h
Simple merge

diff --cc arch/mips/bcm47xx/setup.c
Simple merge

diff --cc arch/mips/bcm47xx/workarounds.c
Simple merge