efi: Exit EFI boot-services before starting the next app

When the app is booting a kernel without using EFI, it must first exit
the boot services provided by EFI. Add a hook for this, using
bootm_final()

Signed-off-by: Simon Glass <sjg@chromium.org>

include/efi.h

@@ -675,6 +675,17 @@ void efi_putc(struct efi_priv *priv, const char ch);
  */
 int efi_stub_exit_boot_services(void);
 
+/**
+ * efi_app_exit_boot_services() - Handle the exit-boot-service procedure
+ *
+ * Tell EFI we don't want their boot services anymore
+ *
+ * This is only available in the app
+ *
+ * Return: 0 if OK, non-zero on error
+ */
+int efi_app_exit_boot_services(struct efi_priv *priv, uint key);
+
 /**
  * efi_get_mmap() - Get the memory map from EFI
  *