efi_loader: fix the online help for bootefi bootmgr

The bootefi command is missing in the online help for
bootefi bootmgr.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 4233d36..2106ed9 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -411,7 +411,7 @@
 	"    Use environment variable efi_selftest to select a single test.\n"
 	"    Use 'setenv efi_selftest list' to enumerate all tests.\n"
 #endif
-	"bootmgr [fdt addr]\n"
+	"bootefi bootmgr [fdt addr]\n"
 	"  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 	"\n"
 	"    If specified, the device tree located at <fdt address> gets\n"