efi_loader: factor out efi_set_load_options()

The bootefi bootmgr command has to set the load options for a loaded image
from the value of BootXXXX variable. If the boot manager is not used, the
value is set from the environment variable bootargs (or efi_selftest).

Factor out a common function efi_set_load_options().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 9894464..ad580bd 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -717,6 +717,9 @@
 efi_status_t efi_deserialize_load_option(struct efi_load_option *lo, u8 *data,
 					 efi_uintn_t *size);
 unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data);
+efi_status_t efi_set_load_options(efi_handle_t handle,
+				  efi_uintn_t load_options_size,
+				  void *load_options);
 efi_status_t efi_bootmgr_load(efi_handle_t *handle);
 
 /**