x86: Rename efi-x86 target to efi-x86_app

To avoid confusion, let's rename the efi-x86 target to efi-x86_app.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/dts/Makefile b/arch/x86/dts/Makefile
index 9872c04..37e4fdc7 100644
--- a/arch/x86/dts/Makefile
+++ b/arch/x86/dts/Makefile
@@ -10,7 +10,7 @@
 	crownbay.dtb \
 	dfi-bt700-q7x-151.dtb \
 	edison.dtb \
-	efi.dtb \
+	efi-x86_app.dtb \
 	efi-x86_payload.dtb \
 	galileo.dtb \
 	minnowmax.dtb \