stm: Update PYBOARD4 pin mapping.

stm/boards/PYBOARD4/pins.csv

-X1,PB6
-X2,PB7
-X3,PC4
-X4,PB5
-X5,Reset
-X6,GND
-X7,3.3V
-X8,VIN
-X9,PA0
-X10,PA1
-X11,PA2
-X12,PA3
-X13,PA4
-X14,PA5
-X15,PA6
-X16,PA7
+X1,PA0
+X2,PA1
+X3,PA2
+X4,PA3
+X5,PA4
+X6,PA5
+X7,PA6
+X8,PA7
+X9,PB6
+X10,PB7
+X11,PC4
+X12,PC5
+X13,Reset
+X14,GND
+X15,3.3V
+X16,VIN
 X17,PB3
 X18,PC13
 X19,PC0
@@ -22,22 +22,22 @@ X21,PC2
 X22,PC3
 X23,A3.3V
 X24,AGND
-Y1,PB10
-Y2,PB11
-Y3,PB0
-Y4,PB1
-Y5,Reset
-Y6,GND
-Y7,3.3V
-Y8,VIN
-Y9,PC6
-Y10,PC7
-Y11,PB8
-Y12,PB9
-Y13,PB12
-Y14,PB13
-Y15,PB14
-Y16,PB15
+Y1,PC6
+Y2,PC7
+Y3,PB8
+Y4,PB9
+Y5,PB12
+Y6,PB13
+Y7,PB14
+Y8,PB15
+Y9,PB10
+Y10,PB11
+Y11,PB0
+Y12,PB1
+Y13,Reset
+Y14,GND
+Y15,3.3V
+Y16,VIN
 LED_BLUE,PB4
 LED_RED,PA13
 LED_GREEN,PA14