stm32f7: board: add splash screen

Support several pixel format (8bits, 16bits, 24bits & 32bits).
Add new file st_logo_data.h which contains logo
stmicroelectronics_uboot_logo_8bit_rle.bmp.

Signed-off-by: yannick fertre <yannick.fertre@st.com>
diff --git a/include/configs/stm32f746-disco.h b/include/configs/stm32f746-disco.h
index 801980e..8b8a73d 100644
--- a/include/configs/stm32f746-disco.h
+++ b/include/configs/stm32f746-disco.h
@@ -79,4 +79,14 @@
 #endif
 /* For SPL ends */
 
+/* For splashcreen */
+#ifdef CONFIG_DM_VIDEO
+#define CONFIG_VIDEO_BMP_RLE8
+#define CONFIG_BMP_16BPP
+#define CONFIG_BMP_24BPP
+#define CONFIG_BMP_32BPP
+#define CONFIG_SPLASH_SCREEN
+#define CONFIG_SPLASH_SCREEN_ALIGN
+#endif
+
 #endif /* __CONFIG_H */