drm/i915/psr: Get pipe id following atomic guidelines

As stated in struct drm_encoder, crtc field should only be used
by non-atomic drivers.

So here caching the pipe id in intel_psr_enable() what is way more
simple and efficient than at every call to
intel_psr_flush()/invalidate() get the
drm.mode_config.connection_mutex lock to safely be able to get the
pipe id by reading drm_connector_state.crtc.

This should fix the null pointer dereference crash below as the
previous way to get the pipe id was prone to race conditions.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105959
Cc: Dhinakaran Pandiyan <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Signed-off-by: José Roberto de Souza <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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