vga_switcheroo: Deduplicate power state tracking

If DRM drivers use runtime PM, they currently notify vga_switcheroo
whenever they ->runtime_suspend or ->runtime_resume to update
vga_switcheroo's internal power state tracking.

That's essentially a duplication of a functionality performed by the
PM core as it already tracks the GPU's power state and vga_switcheroo
can always query it.

Introduce a new internal helper vga_switcheroo_pwr_state() which does
just that if runtime PM is used, or falls back to vga_switcheroo's
internal power state tracking if manual power control is used.
Drop a redundant power state check in set_audio_state() while at it.

This removes one of the two purposes of the notification mechanism
implemented by vga_switcheroo_set_dynamic_switch().  The other one is
power management of the audio device and we'll remove that next.

Cc: Dave Airlie <[email protected]>
Cc: Ben Skeggs <[email protected]>
Cc: Takashi Iwai <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Reviewed-by: Peter Wu <[email protected]>
Tested-by: Kai Heng Feng <[email protected]> # AMD PowerXpress
Tested-by: Mike Lothian <[email protected]>          # AMD PowerXpress
Tested-by: Denis Lisov <[email protected]>       # Nvidia Optimus
Tested-by: Peter Wu <[email protected]>              # Nvidia Optimus
Tested-by: Lukas Wunner <[email protected]>              # MacBook Pro
Signed-off-by: Lukas Wunner <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/0aa49d735b988aa04524a8dc339582ace33f0f94.1520068884.git.lukas@wunner.de

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