configs: stm32f769-disco: Rename stm32f769-disco_defconfig to stm32f769-disco_spl_defconfig

The current stm32f769-disco_defconfig file supports SPL, rename it to
stm32f769-disco_spl_defconfig to reflect the supported configuration.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
diff --git a/board/st/stm32f746-disco/MAINTAINERS b/board/st/stm32f746-disco/MAINTAINERS
index 06d366e..68f61fd 100644
--- a/board/st/stm32f746-disco/MAINTAINERS
+++ b/board/st/stm32f746-disco/MAINTAINERS
@@ -6,3 +6,4 @@
 F:	configs/stm32f746-disco_defconfig
 F:	configs/stm32f746-disco_spl_defconfig
 F:	configs/stm32f769-disco_defconfig
+F:	configs/stm32f769-disco_spl_defconfig
diff --git a/configs/stm32f769-disco_defconfig b/configs/stm32f769-disco_spl_defconfig
similarity index 100%
rename from configs/stm32f769-disco_defconfig
rename to configs/stm32f769-disco_spl_defconfig