Adds HAL support for STM32F401xD variants

[rriveramcrus]

Modifies the stm32f4xx HAL files to add support for the STM32F401xD family of devices. Since STM32F401xE family shares a datasheet with the STM32F401xD family, they are assumed to be similar enough to share the HAL code.

Special attention should be given to the changes made to stm32cube/stm32f4xx/drivers/include/stm32f4xx_hal_flash_ex.h since this is where the D and E families may differ, but I expect the flash IP to be mostly the same.

[erwango]

@rriveramcrus We won't modify these files if the change is not acked beforehand by STM32Cube HAL owners in https://github.com/STMicroelectronics/STM32CubeF4.
So I suggest to raise your point first there.

On my side, I suspect that there is no dedicated define for STM32F401xD because indeed it is similar to STM32F401xE from HAL point of view and hence don't require a specific defined. STM32F401xE should be used instead. But I let F4 package onwers confirm.

I'll nack the change for now, but I'll change depending on HAL team feedback.

[erwango]

See above comment

[rriveramcrus]

STMicroelectronics/STM32CubeF4#192
closing this based on the discussion here

[erwango]

@rriveramcrus We'll need to fix following line https://github.com/zephyrproject-rtos/zephyr/blob/b450c71e4cc083f19880fd36b0ec554b0a756ee0/soc/st/stm32/stm32f4x/Kconfig.soc#L107. Would you mind pushing this change ?