Update pins to include UART1 RTS and CTS

Previous pins definition stated that the UART1 RTS and CTS were not connected. They are connected and can currently be used via A1 and PWM0 respectively. To make things a little clearer, enabling the RTS1/CTS1.

Author: stonehippo

ports/atmel-samd/boards/sparkfun_samd51_micromod/pins.c

@@ -77,8 +77,8 @@ STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     // MicroMod UART1 pins
     { MP_ROM_QSTR(MP_QSTR_UART_TX1), MP_ROM_PTR(&pin_PB31) },     // MicroMod UART_TX1 | CircuitPython TX (PB31)
     { MP_ROM_QSTR(MP_QSTR_UART_RX1), MP_ROM_PTR(&pin_PB30) },     // MicroMod UART_RX1 | CircuitPython RX (PB30)
-    // { MP_ROM_QSTR(MP_QSTR_UART_RTS1), MP_ROM_PTR() },          // MicroMod RTS1 (not connected)
-    // { MP_ROM_QSTR(MP_QSTR_UART_CTS1), MP_ROM_PTR() },          // MicroMod CTS1 (not connected)
+    { MP_ROM_QSTR(MP_QSTR_UART_RTS1), MP_ROM_PTR(&pin_PB00) },          // MicroMod RTS1
+    { MP_ROM_QSTR(MP_QSTR_UART_CTS1), MP_ROM_PTR(&pin_PB01) },          // MicroMod CTS1
 
     // CircuitPython default UART pins
     { MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_PB31) },           // CircuitPython TX | MicroMod UART_TX1 (PB31)