module/mpmm: clear bits before writing to MPMMCR
When setting the MPMM threshold for a specific core, the MPMMCR value was increased using OR operators. However, this approach is only valid if the MPMMCR value is initially 0. Therefore, add a bit-clear instruction before setting the MPMM threshold.
Signed-off-by: Haaris Farooq haaris.farooq@arm.com