stmhal/modmachine: Add machine.UART class, linking to pyb.UART.

pyb.UART has a superset of machine.UART functionality so can be used to
provide compatibility with other ports that also implement machine.UART.

stmhal/modmachine.c

@@ -50,6 +50,7 @@
 #include "rtc.h"
 #include "i2c.h"
 #include "spi.h"
+#include "uart.h"
 #include "wdt.h"
 
 #if defined(MCU_SERIES_F4)
@@ -557,9 +558,9 @@ STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
     // initialize master mode on the peripheral.
     { MP_ROM_QSTR(MP_QSTR_I2C),                 MP_ROM_PTR(&machine_i2c_type) },
     { MP_ROM_QSTR(MP_QSTR_SPI),                 MP_ROM_PTR(&machine_hard_spi_type) },
+    { MP_ROM_QSTR(MP_QSTR_UART),                MP_ROM_PTR(&pyb_uart_type) },
     { MP_ROM_QSTR(MP_QSTR_WDT),                 MP_ROM_PTR(&pyb_wdt_type) },
 #if 0
-    { MP_ROM_QSTR(MP_QSTR_UART),                MP_ROM_PTR(&pyb_uart_type) },
     { MP_ROM_QSTR(MP_QSTR_Timer),               MP_ROM_PTR(&pyb_timer_type) },
     { MP_ROM_QSTR(MP_QSTR_HeartBeat),           MP_ROM_PTR(&pyb_heartbeat_type) },
     { MP_ROM_QSTR(MP_QSTR_SD),                  MP_ROM_PTR(&pyb_sd_type) },