drivers: pwm: nrfx: Improve device generation macros

Use NRFX_FOREACH_PRESENT macro to iterate over all PWM instances
and create device only for those enabled in the devicetree.
This approach removes need of changing driver code when new
instance id is added.

Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>

drivers/pwm/pwm_nrfx.c

@@ -390,50 +390,7 @@ static int pwm_nrfx_pm_action(const struct device *dev,
 			 POST_KERNEL, CONFIG_PWM_INIT_PRIORITY,		      \
 			 &pwm_nrfx_drv_api_funcs)
 
-#ifdef CONFIG_HAS_HW_NRF_PWM0
-PWM_NRFX_DEVICE(0);
-#endif
+#define COND_PWM_NRFX_DEVICE(unused, prefix, i, _) \
+	IF_ENABLED(CONFIG_HAS_HW_NRF_PWM##prefix##i, (PWM_NRFX_DEVICE(prefix##i);))
 
-#ifdef CONFIG_HAS_HW_NRF_PWM1
-PWM_NRFX_DEVICE(1);
-#endif
-
-#ifdef CONFIG_HAS_HW_NRF_PWM2
-PWM_NRFX_DEVICE(2);
-#endif
-
-#ifdef CONFIG_HAS_HW_NRF_PWM3
-PWM_NRFX_DEVICE(3);
-#endif
-
-#ifdef CONFIG_HAS_HW_NRF_PWM20
-PWM_NRFX_DEVICE(20);
-#endif
-
-#ifdef CONFIG_HAS_HW_NRF_PWM21
-PWM_NRFX_DEVICE(21);
-#endif
-
-#ifdef CONFIG_HAS_HW_NRF_PWM22
-PWM_NRFX_DEVICE(22);
-#endif
-
-#ifdef CONFIG_HAS_HW_NRF_PWM120
-PWM_NRFX_DEVICE(120);
-#endif
-
-#ifdef CONFIG_HAS_HW_NRF_PWM130
-PWM_NRFX_DEVICE(130);
-#endif
-
-#ifdef CONFIG_HAS_HW_NRF_PWM131
-PWM_NRFX_DEVICE(131);
-#endif
-
-#ifdef CONFIG_HAS_HW_NRF_PWM132
-PWM_NRFX_DEVICE(132);
-#endif
-
-#ifdef CONFIG_HAS_HW_NRF_PWM133
-PWM_NRFX_DEVICE(133);
-#endif
+NRFX_FOREACH_PRESENT(PWM, COND_PWM_NRFX_DEVICE, (), (), _)