configs: migrate CONFIG_VIDEO_BMP_RLE8 to defconfigs

Done with:
./tools/moveconfig.py VIDEO_BMP_RLE8

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/sandbox_spl_defconfig b/configs/sandbox_spl_defconfig
index 6d8e827..1d49e81 100644
--- a/configs/sandbox_spl_defconfig
+++ b/configs/sandbox_spl_defconfig
@@ -211,6 +211,7 @@
 CONFIG_OSD=y
 CONFIG_SANDBOX_OSD=y
 CONFIG_SPLASH_SCREEN_ALIGN=y
+CONFIG_VIDEO_BMP_RLE8=y
 CONFIG_FS_CBFS=y
 CONFIG_FS_CRAMFS=y
 # CONFIG_SPL_USE_TINY_PRINTF is not set