board: tbs2910: Remove efi loader support in defconfig to reduce u-boot size

Signed-off-by: Soeren Moch <smoch@web.de>
diff --git a/configs/tbs2910_defconfig b/configs/tbs2910_defconfig
index 78beb9a..70a3e18 100644
--- a/configs/tbs2910_defconfig
+++ b/configs/tbs2910_defconfig
@@ -56,3 +56,4 @@
 CONFIG_USB_GADGET_DOWNLOAD=y
 CONFIG_VIDEO=y
 CONFIG_OF_LIBFDT=y
+# CONFIG_EFI_LOADER is not set