bootmeth: use efi_loader interfaces instead of bootefi command

Now that efi_loader subsystem provides interfaces that are equivalent
with bootefi command, we can replace command invocations with APIs.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
diff --git a/boot/Kconfig b/boot/Kconfig
index b438002..987ca73 100644
--- a/boot/Kconfig
+++ b/boot/Kconfig
@@ -523,7 +523,7 @@
 
 config BOOTMETH_EFILOADER
 	bool "Bootdev support for EFI boot"
-	depends on CMD_BOOTEFI
+	depends on BOOTEFI_BOOTMGR
 	default y
 	help
 	  Enables support for EFI boot using bootdevs. This makes the
@@ -558,7 +558,7 @@
 	select BOOTMETH_SCRIPT if CMDLINE # E.g. Armbian uses scripts
 	select BOOTMETH_EXTLINUX  # E.g. Debian uses these
 	select BOOTMETH_EXTLINUX_PXE if CMD_PXE && CMD_NET && DM_ETH
-	select BOOTMETH_EFILOADER if CMD_BOOTEFI # E.g. Ubuntu uses this
+	select BOOTMETH_EFILOADER if BOOTEFI_BOOTMGR # E.g. Ubuntu uses this
 
 config SPL_BOOTMETH_VBE
 	bool "Bootdev support for Verified Boot for Embedded (SPL)"