drivers/flash/nrf_mram: Set no explicit erase capability to true

NRF MRAM does not require erase prior to re-programming already
written area.

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

drivers/flash/Kconfig.nrf_mram

@@ -10,6 +10,7 @@ config SOC_FLASH_NRF_MRAM
 	depends on DT_HAS_NORDIC_MRAM_ENABLED
 	select FLASH_HAS_DRIVER_ENABLED
 	select FLASH_HAS_PAGE_LAYOUT
+	select FLASH_HAS_NO_EXPLICIT_ERASE
 	imply MPU_ALLOW_FLASH_WRITE if ARM_MPU
 	help
 	  Enables Nordic Semiconductor flash driver for MRAM in direct write mode.

drivers/flash/soc_flash_nrf_mram.c

@@ -142,6 +142,9 @@ static const struct flash_parameters *nrf_mram_get_parameters(const struct devic
 	static const struct flash_parameters parameters = {
 		.write_block_size = WRITE_BLOCK_SIZE,
 		.erase_value = ERASE_VALUE,
+		.caps = {
+			.no_explicit_erase = true,
+		},
 	};
 
 	return &parameters;