Fix DAC for F103RF and RG

[MCUdude]

These lines prevented the DAC implementation from working on F103RF and F103RG.
Note that the definition is located in PeripheralPins.c.

[fpistm]

The define have to be in the variant

[MCUdude]

There's an ifdef here:

Arduino_Core_STM32/variants/Generic_F103Rx/PeripheralPins.c

Lines 89 to 97 in 6eaa8d2

	#if defined(STM32F103xE) || defined(STM32F103xG)
	#ifdef HAL_DAC_MODULE_ENABLED
	WEAK const PinMap PinMap_DAC[] = {
	{PA_4, DAC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 1, 0)}, // DAC_OUT1
	{PA_5, DAC1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 2, 0)}, // DAC_OUT2
	{NC, NP, 0}
	};
	#endif
	#endif

But this means we'll have to manually have to enable HAL_ADC_MODULE_ENABLED and HAL_DAC_MODULE_ENABLED? if so, where is HAL_ADC_MODULE_ENABLED defined?

[fpistm]

ADC is defined by default for all as all have an ADC.
DAC is not defined by default so it have to be defined for those which have DAC.
In the peripheral pins, this is not the definition, so if you remove it from variant DAC will not be usable unless user define it thanks build_opt.h or hal_conf_extra.h.