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/cmd/Kconfig b/cmd/Kconfig
index fd1beb0..0d36da2 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1436,6 +1436,7 @@
 config CMD_EFIDEBUG
 	bool "efidebug - display/configure UEFI environment"
 	depends on EFI_LOADER
+	select EFI_DEVICE_PATH_TO_TEXT
 	default n
 	help
 	  Enable the 'efidebug' command which provides a subset of UEFI