hx30. fix board version for tp and audio

Touchpad and audio boards were not reading the correct
ADC channel.
As reported by:
#13

Signed-off-by: Kieran Levin <ktl@frame.work>

Author: kiram9

board/hx20/board.c

@@ -640,11 +640,14 @@ BUILD_ASSERT(ARRAY_SIZE(hx20_board_versions) == BOARD_VERSION_COUNT);
 
 int get_hardware_id(enum adc_channel channel)
 {
-	int version = BOARD_VERSION_UNKNOWN;
+	int version= BOARD_VERSION_UNKNOWN;
 	int mv;
 	int i;
 
-	mv = adc_read_channel(ADC_AD_BID);
+	if (channel >= ADC_CH_COUNT)
+		return BOARD_VERSION_UNKNOWN;
+
+	mv = adc_read_channel(channel);
 
 	if (mv == ADC_READ_ERROR)
 		return BOARD_VERSION_UNKNOWN;