drivers/flash: Select FLASH_DEVICE_REQUIRES_ERASE for Ambiq

The Ambiq provides erase function, but the storage is actually
MRAM based and does not require erase.

Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>

drivers/flash/Kconfig.ambiq

@@ -8,5 +8,6 @@ config FLASH_AMBIQ
  select AMBIQ_HAL
  select FLASH_HAS_PAGE_LAYOUT
  select FLASH_HAS_DRIVER_ENABLED
+ select FLASH_DEVICE_NOT_REQUIRES_ERASE
  help
  Enables Ambiq flash driver on MRAM.

drivers/flash/flash_ambiq.c

@@ -44,6 +44,9 @@ static struct k_sem flash_ambiq_sem;
 static const struct flash_parameters flash_ambiq_parameters = {
  .write_block_size = FLASH_WRITE_BLOCK_SIZE,
  .erase_value = FLASH_ERASE_BYTE,
+ .flags = {
+ .erase_required = false,
+ },
 };
 
 static bool flash_ambiq_valid_range(off_t offset, size_t len)