xtensa: ADSP: fix disabling the IDC interrupt
xtensa: ADSP: fix disabling the IDC interrupt

To disable the IDC interrupt on the interrupt controller a bit
must be set in the MSD register instead of clearing the bit in
the MCD register, which has no effect.

Signed-off-by: Guennadi Liakhovetski <974fc78730de35b120231422a86eeefcb293601e@linux.intel.com>

galak/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr