add ch343 driver

hc

2023-07-06 0d92c6001e626cf3cfa86b826ccc10a16115901e

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CONFIG_SH=y
CONFIG_TARGET_RSK7264=y
CONFIG_BOOTDELAY=3
CONFIG_USE_BOOTARGS=y
CONFIG_BOOTARGS="console=ttySC3,115200"
# CONFIG_CMD_SETEXPR is not set
CONFIG_MTD_NOR_FLASH=y
CONFIG_SCIF_CONSOLE=y
CONFIG_USE_PRIVATE_LIBGCC=y