efi_loader: rename efi_bootmgr_image_return_notify

We use this event when returning from an EFI HTTP booted image.
The name is a bit confusing since it suggests we always run it,
rename it to make it clearer

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
1 file changed