drm/stm: repair runtime power management

Add missing pm_runtime_get_sync() into ltdc_crtc_atomic_enable() to
match pm_runtime_put_sync() in ltdc_crtc_atomic_disable(), otherwise
the LTDC might suspend via runtime PM, disable clock, and then fail
to resume later on.

The test which triggers it is roughly -- run qt5 application which
uses eglfs platform and etnaviv, stop the application, sleep for 15
minutes, run the application again. This leads to a timeout waiting
for vsync, because the LTDC has suspended, but did not resume.

Fixes: 35ab6cfbf211 ("drm/stm: support runtime power management")
Signed-off-by: Marek Vasut <[email protected]>
Cc: Yannick Fertré <[email protected]>
Cc: Philippe Cornu <[email protected]>
Cc: Benjamin Gaignard <[email protected]>
Cc: Vincent Abriou <[email protected]>
Cc: Maxime Coquelin <[email protected]>
Cc: Alexandre Torgue <[email protected]>
To: [email protected]
Cc: [email protected]
Cc: [email protected]
Acked-by: Philippe Cornu <[email protected]>
Tested-by: Yannick Fertre <[email protected]>
Signed-off-by: Benjamin Gaignard <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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