This is hacked into the driver at present. It seems better to have it as
a separate driver that uses the base driver. Create a new file and put
the X86 code into it.

Actually the Baytrail settings should really come from the device tree.

Note that 'has_max_speed' is added as well. This is currently always false
but since only Baytrail provides the config, it does not affect operation
for other devices.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NHeiko Schocher <hs@denx.de>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>