[NUCLEO_F103RB] Remove PD_0/PD_1 pins

These pins are not present in the 64 pins package.

Author: bcostm

libraries/mbed/targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/PinNames.h

@@ -104,8 +104,6 @@ typedef enum {
     PC_14 = 0x2E,
     PC_15 = 0x2F,
 
-    PD_0  = 0x30,
-    PD_1  = 0x31,
     PD_2  = 0x32,
 
     // Arduino connector namings