efi_loader: Allow to compile helloworld.efi w/o bundling it

Today we can compile a self-contained hello world efi test binary that
allows us to quickly verify whether the EFI loader framwork works.

We can use that binary outside of the self-contained test case though,
by providing it to a to-be-tested system via tftp.

This patch separates compilation of the helloworld.efi file from
including it in the u-boot binary for "bootefi hello". It also modifies
the efi_loader test case to enable travis to pick up the compiled file.
Because we're now no longer bloating the resulting u-boot binary, we
can enable compilation always, giving us good travis test coverage.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 2a2f23e..b16c603 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -181,9 +181,22 @@
 	help
 	  Boot an EFI image from memory.
 
+config CMD_BOOTEFI_HELLO_COMPILE
+	bool "Compile a standard EFI hello world binary for testing"
+	depends on CMD_BOOTEFI && (ARM || X86)
+	default y
+	help
+	  This compiles a standard EFI hello world application with U-Boot so
+	  that it can be used with the test/py testing framework. This is useful
+	  for testing that EFI is working at a basic level, and for bringing
+	  up EFI support on a new architecture.
+
+	  No additional space will be required in the resulting U-Boot binary
+	  when this option is enabled.
+
 config CMD_BOOTEFI_HELLO
 	bool "Allow booting a standard EFI hello world for testing"
-	depends on CMD_BOOTEFI && (ARM || X86)
+	depends on CMD_BOOTEFI_HELLO_COMPILE
 	help
 	  This adds a standard EFI hello world application to U-Boot so that
 	  it can be used with the 'bootefi hello' command. This is useful