Merge pull request #3610 from Sunwancn/stm32l433-st-nucleo

[BSP]Add stm32l433-st-nucleo BSP

Author: BernardXiong

.travis.yml

@@ -112,6 +112,7 @@ env:
   - RTT_BSP='stm32/stm32l053-st-nucleo' RTT_TOOL_CHAIN='sourcery-arm'
   - RTT_BSP='stm32/stm32l412-st-nucleo' RTT_TOOL_CHAIN='sourcery-arm'
   - RTT_BSP='stm32/stm32l432-st-nucleo' RTT_TOOL_CHAIN='sourcery-arm'
+  - RTT_BSP='stm32/stm32l433-st-nucleo' RTT_TOOL_CHAIN='sourcery-arm'
   - RTT_BSP='stm32/stm32l475-atk-pandora' RTT_TOOL_CHAIN='sourcery-arm'
   - RTT_BSP='stm32/stm32l475-st-discovery' RTT_TOOL_CHAIN='sourcery-arm'
   - RTT_BSP='stm32/stm32l476-st-nucleo' RTT_TOOL_CHAIN='sourcery-arm'