pmdomain: core: Use dev_name() instead of kobject_get_path() in debugfs

Using kobject_get_path() means a dynamic memory allocation gets done, which
doesn't work on a PREEMPT_RT based configuration while holding genpd's raw
spinlock.

To fix the problem, let's convert into using the simpler dev_name(). This
means the information about the path doesn't get presented in debugfs, but
hopefully this shouldn't be an issue.

Signed-off-by: Ulf Hansson <[email protected]>
Tested-by: Raghavendra Kakarla <[email protected]>  # qcm6490 with PREEMPT_RT set
Acked-by: Sebastian Andrzej Siewior <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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