Fix HIFI compilation of STM32duino core

Author: tfry-git

internal/config_checks_stm32duino.h

@@ -120,9 +120,9 @@ MOZZI_CHECK_SUPPORTED(MOZZI_AUDIO_MODE, MOZZI_OUTPUT_EXTERNAL_TIMED, MOZZI_OUTPU
 #  include "disable_stereo_on_github_workflow.h"
 MOZZI_CHECK_SUPPORTED(MOZZI_AUDIO_CHANNELS, 1)
 #  if !defined(MOZZI_AUDIO_PER_CHANNEL)
-#    define MOZZI_AUDIO_PER_CHANNEL 7
+#    define MOZZI_AUDIO_BITS_PER_CHANNEL 7
 #  endif
-#  define MOZZI_AUDIO_BITS MOZZI_AUDIO_BITS_PER_CHANNEL * 2
+#  define MOZZI_AUDIO_BITS (MOZZI_AUDIO_BITS_PER_CHANNEL * 2)
 #endif
 
 #if !defined(MOZZI_ANALOG_READ)