boot: enable booting via EFI boot manager by default

If UEFI is enabled in U-Boot, we want it to conform to the UEFI
specification. This requires enabling the boot manager boot method.

Reported-by: E Shattow <lucent@gmail.com>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/boot/Kconfig b/boot/Kconfig
index 3d7aabd..d9a6c27 100644
--- a/boot/Kconfig
+++ b/boot/Kconfig
@@ -558,6 +558,16 @@
 
 	  This provides a way to try out standard boot on an existing boot flow.
 
+config BOOTMETH_EFI_BOOTMGR
+	bool "Bootdev support for EFI boot manager"
+	depends on EFI_BOOTMGR
+	select BOOTMETH_GLOBAL
+	default y
+	help
+	  Enable booting via the UEFI boot manager. Based on the EFI variables
+	  the EFI binary to be launched is determined. To set the EFI variables
+	  use the eficonfig command.
+
 config BOOTMETH_VBE
 	bool "Bootdev support for Verified Boot for Embedded"
 	depends on FIT