clk: Use parent node pointer during registration if necessary

Sometimes clk drivers are attached to devices which are children of a
parent device that is connected to a node in DT. This happens when
devices are MFD-ish and the parent device driver mostly registers child
devices to match against drivers placed in their respective subsystem
directories like drivers/clk, drivers/regulator, etc. When the clk
driver calls clk_register() with a device pointer, that struct device
pointer won't have a device_node associated with it because it was
created purely in software as a way to partition logic to a subsystem.

This causes problems for the way we find parent clks for the clks
registered by these child devices because we look at the registering
device's device_node pointer to lookup 'clocks' and 'clock-names'
properties. Let's use the parent device's device_node pointer if the
registering device doesn't have a device_node but the parent does. This
simplifies clk registration code by avoiding the need to assign some
device_node to the device registering the clk.

Cc: Bjorn Andersson <[email protected]>
Reported-by: Niklas Cassel <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: Fixup kernel-doc notation]
Reviewed-by: Niklas Cassel <[email protected]>
Reviewed-by: Bjorn Andersson <[email protected]>
Tested-by: Bjorn Andersson <[email protected]>

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