drivers: dai: ssp: fix MN_MDIVCTRL_M_DIV_ENABLE for ACE+ platform

In previous generations, each MCLK divider could be enabled separately.

Starting with ACE, there is a single-bit MDE field to enable a single
divider. The existing code would not enable MDE in case MCLK1 is used.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>