[ALSA] Fix maestro3 hang after cold boot

Modules: Maestro3 driver

This patch fixes the maestro3 driver to call the snd_m3_assp_init
function to write the DSP firmware into the ASSP chip before sending the
RUN_ASSP command, thereby solving the hang after a cold boot.

Signed-off-by: Charles R. Anderson <cra@alum.wpi.edu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>