efi_driver: add init function to EFI block driver

For handling added and removed block devices we need to register events
which has to be done when the driver is installed.

This patch only creates an empty init function that will be filled with
code later on. The function needs to be called before any EFI block devices
are used. Move the efi_driver_init() call to early init.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/include/efi_driver.h b/include/efi_driver.h
index 71e0d31..63a95e4 100644
--- a/include/efi_driver.h
+++ b/include/efi_driver.h
@@ -32,12 +32,15 @@
  *			EFI_DRIVER_BINDING_PROTOCOL.
  * @child_protocol:	Protocol supported by the child handles generated by
  *			the EFI driver.
+ * @init:		Function called by the EFI uclass after installing the
+ *			driver binding protocol.
  * @bind:		Function called by the EFI uclass to attach the
  *			driver to EFI driver to a handle.
  */
 struct efi_driver_ops {
 	const efi_guid_t *protocol;
 	const efi_guid_t *child_protocol;
+	efi_status_t (*init)(struct efi_driver_binding_extended_protocol *this);
 	efi_status_t (*bind)(struct efi_driver_binding_extended_protocol *this,
 			     efi_handle_t handle, void *interface);
 };