DAC Exported Constants

Modules
	DAC flags
	Flags defines which can be used with LL_DAC_ReadReg function.
	DAC interruptions
	IT defines which can be used with LL_DAC_ReadReg and LL_DAC_WriteReg functions.
	DAC channels
	DAC operating mode
	DAC trigger source
	DAC waveform automatic generation mode
	DAC wave generation - Noise LFSR unmask bits
	DAC wave generation - Triangle amplitude
	DAC channel output mode
	DAC channel output buffer
	DAC channel output connection
	DAC literals legacy naming
	DAC channel output resolution
	DAC registers compliant with specific purpose
	Definitions of DAC hardware constraints delays