[bsp][wch] move ch32v20x sdk to package (#10023)

* [bsp][wch]to clear the serial of ch32v20x

* [bsp][wch] move ch32v20x sdk to pkg

* [ci] add ch32v208 bsp

* [bsp][wch] update readme

Author: kaidegit

.github/workflows/bsp_buildings.yml

@@ -354,6 +354,7 @@ jobs:
             RTT_TOOL_CHAIN: "sourcery-riscv-none-embed"
             SUB_RTT_BSP:  
                 - "k210"
+                - "wch/risc-v/ch32v208w-r0"
                 - "wch/risc-v/ch32v307v-r1"
                 - "wch/risc-v/yd-ch32v307vct6"
          -  RTT_BSP: "riscv64-unknown" 

bsp/wch/risc-v/Libraries/Kconfig

@@ -12,6 +12,16 @@ config SOC_RISCV_SERIES_CH32V2
     select ARCH_RISCV
     select SOC_RISCV_FAMILY_CH32
     select RT_USING_HW_ATOMIC
+    select PKG_USING_CH32V20x_SDK
+
+config SOC_RISCV_SERIES_CH32V20x_D6
+    bool
+
+config SOC_RISCV_SERIES_CH32V20x_D8
+    bool
+
+config SOC_RISCV_SERIES_CH32V20x_D8W
+    bool
 
 config SOC_RISCV_SERIES_CH32V3
     bool