[ln882h] Reduce transfer baudrate to improve reliability (#66)

Author: lamauny

ltchiptool/soc/ln882h/util/ln882htool.py

@@ -14,7 +14,7 @@
 
 _T_YmodemCB = Optional[Callable[[int, str, int, int], None]]
 
-LN882H_YM_BAUDRATE = 2000000
+LN882H_YM_BAUDRATE = 1000000
 LN882H_ROM_BAUDRATE = 115200
 LN882H_FLASH_ADDRESS = 0x0000000
 LN882H_RAM_ADDRESS = 0x20000000