ARM: dts: keystone-k2hk: Move keystone_dsp_gpio to under device-state-control

The keystone_irq node describes a device that is a member of the device
state control module address space. As such, it should not be a member
of soc0 bus but instead a sub-node of device-state-control.

This move also fixes warnings about not having a reg property. Now
that this is a sub-node of device-state-control, a syscon type node,
we add this reg property but relative to the syscon base, this way
when the dt-binding/driver are updated we can drop the non-standard
gpio,syscon-dev property completely and simply use get_resource() in
the driver.

Signed-off-by: Andrew F. Davis <[email protected]>
Acked-by: Nishanth Menon <[email protected]>
Signed-off-by: Santosh Shilimkar <[email protected]>

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