添加STM32WB系列BSP

Author: Dozingfiretruck

.travis.yml

@@ -126,6 +126,7 @@ env:
   - RTT_BSP='stm32/stm32mp157a-st-ev1' RTT_TOOL_CHAIN='sourcery-arm'
   - RTT_BSP='stm32f20x' RTT_TOOL_CHAIN='sourcery-arm'
   - RTT_BSP='swm320-lq100' RTT_TOOL_CHAIN='sourcery-arm'
+  - RTT_BSP='stm32/stm32wb55-st-nucleo' RTT_TOOL_CHAIN='sourcery-arm'
 #  - RTT_BSP='taihu' RTT_TOOL_CHAIN='sourcery-ppc'
 #  - RTT_BSP='upd70f3454' # iar
 #  - RTT_BSP='x86' # x86