ASoC: SOF: mediatek: initialize panic_info to zero

Coverity spotted that panic_info is not initialized to zero in
mtk_adsp_dump. Using uninitialized value panic_info.linenum when
calling snd_sof_get_status. Fix this coverity by initializing
panic_info struct as zero.

Signed-off-by: YC Hung <yc.hung@mediatek.com>
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>
Link: https://lore.kernel.org/r/20221213115617.25086-1-yc.hung@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: SOF: mediatek: Add mediatek common debug dump

1.Add mtk-adsp-common.c file for mediatek platforms common usage.
2.Add mtk_adsp_dump implementation in mtk-adsp-common.c for general
debug dump.

Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: YC Hung <yc.hung@mediatek.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220517173109.468568-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>