Start inner loop from i+1 to halve iterations and eliminate
redundant checks.

Signed-off-by: Shriram Shastry <malladi.sastry@intel.com>

Adjust loop boundary to ensure correct number of elements are
processed.

Signed-off-by: Shriram Shastry <malladi.sastry@intel.com>

Use int32_t instead of int64_t to improve performance in level_update.

Improve comments in max_mic_distance function to better explain the
distance calculation between all possible microphone pairs. Correct
the typo in line_array_mode_check function.

Signed-off-by: Shriram Shastry <malladi.sastry@intel.com>

Address reviewer comments: Improve comments in max_mic_distance and
correct typo in line_array_mode_check