TARGET_CYW4343X Bluetooth HCI driver is specific to STM32 targets
derived from USI_WM_BN_BM_22. Move the driver implementation to
TARGET_STM folder to not interfere with Cypress implementation at
TARGET_Cypress/TARGET_CYW43XXX/HCIDriver.cpp that is enabled for
PSoC 6 targets which also include the CYW4343X label.
Volodymyr Medvid