include: zephyr: drivers: adc.h: Replace FOREACH with CHILD_BY_REG_ADDR

The macro to initialise a struct adc_dt_spec instance uses a FOREACH macro,
which can be problematic when nesting in other FOREACH macros, for example
in driver implementations.

Replace it with DT_CHILD_BY_REG_ADDR.

Signed-off-by: Pieter De Gendt <pieter.degendt@basalte.be>

Author: pdgendt

include/zephyr/drivers/adc.h

@@ -340,10 +340,7 @@ struct adc_dt_spec {
 	}
 
 #define ADC_CHANNEL_DT_NODE(ctlr, input) \
-	DT_FOREACH_CHILD_VARGS(ctlr, ADC_FOREACH_INPUT, input)
-
-#define ADC_FOREACH_INPUT(node, input) \
-	IF_ENABLED(IS_EQ(DT_REG_ADDR_RAW(node), input), (node))
+	DT_CHILD_BY_REG_ADDR(ctlr, 0, input)
 
 #define ADC_CHANNEL_CFG_FROM_DT_NODE(node_id) \
 	IF_ENABLED(DT_NODE_EXISTS(node_id), \