runtime/stm32wlx: change order for init so clock speeds are set before peripheral start

Signed-off-by: deadprogram <ron@hybridgroup.com>

src/runtime/runtime_stm32wlx.go

@@ -21,12 +21,11 @@ func init() {
 	// Configure 48Mhz clock
 	initCLK()
 
-	// UART init
-	machine.InitSerial()
-
 	// Timers init
 	initTickTimer(&machine.TIM1)
 
+	// UART init
+	machine.InitSerial()
 }
 
 func initCLK() {