efi_loader: Rename and move CMD_BOOTEFI_HELLO_COMPILE

This is not actually a command so the name is confusing. Use
BOOTEFI_HELLO_COMPILE instead. Put it in the efi_loader directory
with the other such config options.

The link rule (for $(obj)/%_efi.so) in scripts/Makefile.lib handles
pulling in efi_crt0.o and efi_reloc.o so drop the 'extra' rules.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index 2af6f20..27dbd9e 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -27,7 +27,7 @@
 targets += boothart.o
 endif
 
-ifneq ($(CONFIG_CMD_BOOTEFI_HELLO_COMPILE),)
+ifneq ($(CONFIG_BOOTEFI_HELLO_COMPILE),)
 always += helloworld.efi
 targets += helloworld.o
 endif