drivers: adc: adopt new zephyr_count_bits util function

Adopt new zephyr_count_bits helper from util.h and avoid
having conflicting definition

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>

Author: kartben

drivers/adc/adc_sam.c

@@ -16,6 +16,7 @@
 
 #include <zephyr/logging/log.h>
 #include <zephyr/irq.h>
+#include <zephyr/sys/util.h>
 LOG_MODULE_REGISTER(adc_sam, CONFIG_ADC_LOG_LEVEL);
 
 #define SAM_ADC_NUM_CHANNELS 16
@@ -51,18 +52,6 @@ struct adc_sam_data {
 	uint8_t num_active_channels;
 };
 
-static uint8_t count_bits(uint32_t val)
-{
-	uint8_t res = 0;
-
-	while (val) {
-		res += val & 1U;
-		val >>= 1;
-	}
-
-	return res;
-}
-
 static int adc_sam_channel_setup(const struct device *dev,
 				 const struct adc_channel_cfg *channel_cfg)
 {
@@ -156,7 +145,8 @@ static void adc_context_start_sampling(struct adc_context *ctx)
 	const struct adc_sam_config *const cfg = data->dev->config;
 	Adc *const adc = cfg->regs;
 
-	data->num_active_channels = count_bits(ctx->sequence.channels);
+	data->num_active_channels =
+		zephyr_count_bits(&ctx->sequence.channels, sizeof(ctx->sequence.channels));
 
 	/* Disable all */
 	adc->ADC_CHDR = 0xffff;
@@ -222,7 +212,7 @@ static int start_read(const struct device *dev,
 		return -EINVAL;
 	}
 
-	data->num_active_channels = count_bits(channels);
+	data->num_active_channels = zephyr_count_bits(&channels, sizeof(channels));
 
 	error = check_buffer_size(sequence, data->num_active_channels);
 	if (error) {