Support for STM32U3

[alexceltare2]

STM32U3 uses 2 banks of 4KB pages and each bank is 128 pages so that gives us 1MB of Flash storage. Can you help to add 2 things:

• support for STM32U3 erase in the form of:
  #ifdef STM32U3
#define EE_ERASE EE_ERASE_PAGE_NUMBER
#endif

• Increase the size allowed for Selected emulation page/sector to 128 pages when manually configure as there is a hard limit imposed of 64 pages in MXCube.

[alexceltare2]

To add to that, U3 needs 2 more tweaks:

• The if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, eeHandle.Address + i, doubleWord) != HAL_OK) part needs to be a pointer as such: if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, eeHandle.Address + i, (uint32_t)(&doubleWord)) != HAL_OK) because the internal function FLASH_Program_Burst(...) expects a pointer.

• According to this, if the Voltage Scaling is set to Scale 2, that needs to be reverted to Scale 1 before flashing.