efi_loader: make device path to text protocol customizable

The device path to text protocol is not needed for EBBR compliance. So
let's make it a customizable option.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index 3feb04a..6501ee5 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -18,6 +18,13 @@
 
 if EFI_LOADER
 
+config EFI_DEVICE_PATH_TO_TEXT
+	bool "Device path to text protocol"
+	default y
+	help
+	  The device path to text protocol converts device nodes and paths to
+	  human readable strings.
+
 config EFI_LOADER_HII
 	bool "HII protocols"
 	default y