feat(st): add build configs for STM32MP2

Add configuration to build STM32MP2 platform. The default config uses
OP-TEE as SPD, a DDR4, and uses eMMC or SD-card for boot device.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: Id6b3c6fcd09ddfd87d2780c1da55b07ebf52a7ae
diff --git a/tf_config/stm32mp2-default b/tf_config/stm32mp2-default
new file mode 100644
index 0000000..bbb1820
--- /dev/null
+++ b/tf_config/stm32mp2-default
@@ -0,0 +1,8 @@
+ARCH=aarch64
+CROSS_COMPILE=aarch64-none-elf-
+DTB_FILE_NAME=stm32mp257f-ev1.dtb
+PLAT=stm32mp2
+SPD=opteed
+STM32MP_DDR4_TYPE=1
+STM32MP_EMMC=1
+STM32MP_SDMMC=1