phy: core: Add documentation of phy operation order

Add documentation on phy function usage: init function must be
called before power_on; power_off must be called before exit.

Signed-off-by: Jules Maselbas <[email protected]>
Cc: Ahmad Fatoum <[email protected]>
Cc: Amelie DELAUNAY <[email protected]>
Cc: Minas Harutyunyan <[email protected]>
Cc: Kishon Vijay Abraham I <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

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