cores: arduino: add macro to find pins by node

Add `DIGITAL_PIN_GPIOS_FIND_NODE` helper macro.

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Pick: arduino@a60cd82a

Co-Authored-by: Sebastian Romero <s.romero@arduino.cc>
Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

Author: sebromero

cores/arduino/Arduino.h

@@ -35,6 +35,11 @@
 #undef DIGITAL_PIN_CHECK_UNIQUE
 #endif
 
+// Helper macro to get Arduino pin number from device tree alias
+#define DIGITAL_PIN_GPIOS_FIND_NODE(node)                                                          \
+	DIGITAL_PIN_GPIOS_FIND_PIN(DT_REG_ADDR(DT_PHANDLE_BY_IDX(node, gpios, 0)),                     \
+							   DT_PHA_BY_IDX(node, gpios, 0, pin))
+
 /* Return the index of it if matched, oterwise return 0 */
 #define LED_BUILTIN_INDEX_BY_REG_AND_PINNUM(n, p, i, dev, num)                                     \
 	(DIGITAL_PIN_EXISTS(n, p, i, dev, num) ? i : 0)