add touch driver for stm32l4r9-st-eval board
add sram driver for stm32l4r9-st-eval board
fix [HAL_Drivers/drv_gpio.c] for L4 serials about VDDIO2 enable
fix [HAL_Drivers/SConscript] for can not auto remove [soft_iic.c] file when not define BSP_USING_IICx
jhb