arm: stm32mp: add defconfig for trusted boot with FIP

Add TF-A FIP support for trusted boot on STM32MP15x,
when STM32MP15x_STM32IMAGE is not activated.

With FIP support the SSBL partition is named "fip" and its size is 4MB,
so the ENV partition name in device tree  (for SD card or eMMC)
or offset in defconfig (CONFIG_ENV_OFFSET / CONFIG_ENV_OFFSET_REDUND)
need to be modified.

With FIP the TEE MTD partitions are removed because the OP-TEE binray are
included in the FIP containers.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi b/arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi
index ace51f9..0101962 100644
--- a/arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi
+++ b/arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi
@@ -15,13 +15,17 @@
 	config {
 		u-boot,boot-led = "heartbeat";
 		u-boot,error-led = "error";
-		u-boot,mmc-env-partition = "ssbl";
+		u-boot,mmc-env-partition = "fip";
 		st,adc_usb_pd = <&adc1 18>, <&adc1 19>;
 		st,fastboot-gpios = <&gpioa 13 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
 		st,stm32prog-gpios = <&gpioa 14 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
 	};
 
 #ifdef CONFIG_STM32MP15x_STM32IMAGE
+	config {
+		u-boot,mmc-env-partition = "ssbl";
+	};
+
 	/* only needed for boot with TF-A, witout FIP support */
 	firmware {
 		optee {