efi_loader: fix CONFIG_EFI_HTTP dependencies

efi_loader: fix CONFIG_EFI_HTTP dependencies

CONFIG_CMD_DNS and CONFIG_CMD_WGET depend on CONFIG_CMD_NET.
CONFIG_CMD_NET depends on CONFIG_NET or CONFIG_NET_LWIP.

We shall only enable CONFIG_EFI_HTTP if there is network support.
We have to select CONFIG_CMD_NET.

Fixes: d7d07a8b508b ("efi_loader: support boot from URI device path")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>