It shouldn't be necessary to disable the mpu for this test. Enable
CONFIG_MPU_ALLOW_FLASH_WRITE=y instead.
Signed-off-by: Maureen Helm <maureen.helm@nxp.com>
With upcoming ICs that are not in the nRF5x family, rename the flash
driver and all its dependencies from nrf5 to nrf.
Should also fix the issue introduced by f49150cab6 which broke the
assignment of the flash device due to a partial rename.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>