examples/hwapi/hwconfig*: Use inline Signal() args where possible.

examples/hwapi/hwconfig_esp8266_esp12.py

@@ -2,4 +2,4 @@ from machine import Pin, Signal
 
 # ESP12 module as used by many boards
 # Blue LED on pin 2, active low (inverted)
-LED = Signal(Pin(2, Pin.OUT), invert=True)
+LED = Signal(2, Pin.OUT, invert=True)

examples/hwapi/hwconfig_pyboard.py

 from machine import Pin, Signal
 
 # Red LED on pin LED_RED also kown as A13
-LED = Signal(Pin('LED_RED', Pin.OUT))
+LED = Signal('LED_RED', Pin.OUT)
 
 # Green LED on pin LED_GREEN also known as A14
-LED2 = Signal(Pin('LED_GREEN', Pin.OUT))
+LED2 = Signal('LED_GREEN', Pin.OUT)
 
 # Yellow LED on pin LED_YELLOW also known as A15
-LED3 = Signal(Pin('LED_YELLOW', Pin.OUT))
+LED3 = Signal('LED_YELLOW', Pin.OUT)
 
 # Blue LED on pin LED_BLUE also known as B4
-LED4 = Signal(Pin('LED_BLUE', Pin.OUT))
+LED4 = Signal('LED_BLUE', Pin.OUT)

examples/hwapi/hwconfig_z_frdm_k64f.py

@@ -2,4 +2,4 @@ from machine import Pin, Signal
 
 # Freescale/NXP FRDM-K64F board
 # Blue LED on port B, pin 21
-LED = Signal(Pin(("GPIO_1", 21), Pin.OUT))
+LED = Signal(("GPIO_1", 21), Pin.OUT)