docs: pm: Add introduction section in system pm
Create a introduction section just like the others chapters. Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
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System Power Management
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System Power Management
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#######################
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#######################
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Introduction
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************
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The kernel enters the idle state when it has nothing to schedule.
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The kernel enters the idle state when it has nothing to schedule.
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Enabling :kconfig:option:`CONFIG_PM` allows the kernel to call upon the
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Enabling :kconfig:option:`CONFIG_PM` allows the kernel to call upon the
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power management subsystem to put an idle system into one of the supported power states.
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power management subsystem to put an idle system into one of the supported power states.
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