configs: stm32mp15: Enable SPI relative flags

Enable STM32_SPI, SPI, DM_SPI and CMD_SPI flags.
This enables the SPI support for STM32MP15.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/configs/stm32mp15_trusted_defconfig b/configs/stm32mp15_trusted_defconfig
index 22ca23d..40f600f 100644
--- a/configs/stm32mp15_trusted_defconfig
+++ b/configs/stm32mp15_trusted_defconfig
@@ -23,6 +23,7 @@
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_SF=y
+CONFIG_CMD_SPI=y
 CONFIG_CMD_USB=y
 CONFIG_CMD_USB_MASS_STORAGE=y
 CONFIG_CMD_CACHE=y
@@ -86,6 +87,7 @@
 CONFIG_SPI=y
 CONFIG_DM_SPI=y
 CONFIG_STM32_QSPI=y
+CONFIG_STM32_SPI=y
 CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_DM_USB_GADGET=y