cpuidle: Use of_property_present() for testing DT property presence

It is preferred to use typed property access functions (i.e.
of_property_read_<type> functions) rather than low-level
of_get_property/of_find_property functions for reading properties. As
part of this, convert of_get_property/of_find_property calls to the
recently added of_property_present() helper when we just want to test
for presence of a property and nothing more.

Signed-off-by: Rob Herring <[email protected]>
Acked-by: Ulf Hansson <[email protected]>
Acked-by: Anup Patel <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

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