[bsp][stm32]去除 drv_eth.c 和 lwip 的依赖关系。

bsp/stm32/libraries/HAL_Drivers/SConscript

@@ -30,7 +30,7 @@ if GetDepend(['RT_USING_I2C', 'RT_USING_I2C_BITOPS']):
     if GetDepend('BSP_USING_I2C1') or GetDepend('BSP_USING_I2C2') or GetDepend('BSP_USING_I2C3') or GetDepend('BSP_USING_I2C4'):
         src += ['drv_soft_i2c.c']
 
-if GetDepend('RT_USING_LWIP'):
+if GetDepend('BSP_USING_ETH'):
     src += ['drv_eth.c']
 
 if GetDepend(['RT_USING_ADC']):