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>

arch/x86/cpu/efi/Makefile

@@ -3,7 +3,7 @@
 # Copyright (c) 2015 Google, Inc
 
 ifdef CONFIG_EFI_APP
-obj-y += efi.o
+obj-y += app.o
 obj-y += sdram.o
 endif
 

arch/x86/cpu/intel_common/Makefile

@@ -10,7 +10,7 @@ obj-$(CONFIG_$(SPL_)X86_32BIT_INIT) += mrc.o
 endif
 obj-y += cpu.o
 obj-y += lpc.o
-ifndef CONFIG_TARGET_EFI
+ifndef CONFIG_TARGET_EFI_APP
 obj-y += microcode.o
 endif
 obj-y += pch.o