Fix PWM_PINS macro compilation without digital-pin-gpios

[Copilot]

The PWM_PINS macro unconditionally uses DIGITAL_PIN_GPIOS_FIND_PIN, which is only defined when /zephyr,user/digital-pin-gpios exists. Boards using global GPIO numbering with pwm-pin-gpios but no digital-pin-gpios fail to compile.

Changes:

• Add conditional compilation to PWM_PINS macro in cores/arduino/zephyrCommon.cpp:
  • When digital_pin_gpios exists: use DIGITAL_PIN_GPIOS_FIND_PIN (existing behavior)
  • When digital_pin_gpios absent: use ZARD_GLOBAL_GPIO_NUM to compute global GPIO numbers
• Fix indentation to use tabs per project style

This mirrors the pattern already used for ADC pins in Arduino.h (lines 159-170).

#if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), digital_pin_gpios)
#define PWM_PINS(n, p, i) \
	DIGITAL_PIN_GPIOS_FIND_PIN( \
		DT_REG_ADDR(DT_PHANDLE_BY_IDX(DT_PATH(zephyr_user), p, i)), \
		DT_PHA_BY_IDX(DT_PATH(zephyr_user), p, i, pin)),
#else
#define PWM_PINS(n, p, i) \
	ZARD_GLOBAL_GPIO_NUM(DT_PHANDLE_BY_IDX(DT_PATH(zephyr_user), p, i)) + \
		DT_PHA_BY_IDX(DT_PATH(zephyr_user), p, i, pin),
#endif

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