ASoC: codecs: Axe some dead code in 'wcd_mbhc_adc_hs_rem_irq()'

'hphpa_on' is know to be false, so this is just dead code that should be
removed.
Suggested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/57a89cc31eb2312addd3c77896d7df8206aef138.1635967035.git.christophe.jaillet@wanadoo.frSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wcd-mbhc-v2.c

@@ -1176,7 +1176,6 @@ static irqreturn_t wcd_mbhc_adc_hs_rem_irq(int irq, void *data)
 	struct wcd_mbhc *mbhc = data;
 	unsigned long timeout;
 	int adc_threshold, output_mv, retry = 0;
-	bool hphpa_on = false;
 
 	mutex_lock(&mbhc->lock);
 	timeout = jiffies + msecs_to_jiffies(WCD_FAKE_REMOVAL_MIN_PERIOD_MS);
@@ -1210,10 +1209,6 @@ static irqreturn_t wcd_mbhc_adc_hs_rem_irq(int irq, void *data)
 	wcd_mbhc_elec_hs_report_unplug(mbhc);
 	wcd_mbhc_write_field(mbhc, WCD_MBHC_BTN_ISRC_CTL, 0);
 
-	if (hphpa_on) {
-		hphpa_on = false;
-		wcd_mbhc_write_field(mbhc, WCD_MBHC_HPH_PA_EN, 3);
-	}
 exit:
 	mutex_unlock(&mbhc->lock);
 	return IRQ_HANDLED;