HISI LPC: Support the LPC host on Hip06/Hip07 with DT bindings

The low-pin-count (LPC) interface of Hip06/Hip07 accesses I/O port space of
peripherals.

Implement the LPC host controller driver which performs the I/O operations
on the underlying hardware.  We don't want to touch existing drivers such
as ipmi-bt, so this driver applies the indirect-IO introduced in the
previous patch after registering an indirect-IO node to the indirect-IO
devices list which will be searched by the I/O accessors to retrieve the
host-local I/O port.

The driver config is set as a bool instead of a tristate.  The reason here
is that, by the very nature of the driver providing a logical PIO range, it
does not make sense to have this driver as a loadable module.  Another more
specific reason is that the Huawei D03 board which includes Hip06 SoC
requires the LPC bus for UART console, so should be built in.

Tested-by: dann frazier <[email protected]>
Signed-off-by: Zou Rongrong <[email protected]>
Signed-off-by: Zhichang Yuan <[email protected]>
Signed-off-by: John Garry <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Acked-by: Rob Herring <[email protected]>	# dts part

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