stm32mp1: configs: Add CONFIG_SPL_SPI_FLASH_MTD

As SPI_FLASH_MTD is used in SPL and U-Boot proper, we enable both,
now that a separate option for SPL was introduced.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
[jagan: drop unrelated change]
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/configs/stm32mp15_basic_defconfig b/configs/stm32mp15_basic_defconfig
index c54feb0..2a54e71 100644
--- a/configs/stm32mp15_basic_defconfig
+++ b/configs/stm32mp15_basic_defconfig
@@ -90,6 +90,7 @@
 CONFIG_SPI_FLASH_WINBOND=y
 # CONFIG_SPI_FLASH_USE_4K_SECTORS is not set
 CONFIG_SPI_FLASH_MTD=y
+CONFIG_SPL_SPI_FLASH_MTD=y
 CONFIG_DM_ETH=y
 CONFIG_DWC_ETH_QOS=y
 CONFIG_PHY=y