drm/i915/psr: Try to program link training times correctly

The default of 0 is 500us of link training, but that's not enough for
some platforms. Decoding this correctly means we're using 2.5ms of
link training on these platforms, which fixes flickering issues
associated with enabling PSR.

v2: Unbotch the math a bit.

v3: Drop debug hunk.

v4: Improve commit message.

Tested-by: Lyude <[email protected]>
Cc: Lyude <[email protected]>
Cc: [email protected]
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95176
Cc: Rodrigo Vivi <[email protected]>
Cc: Sonika Jindal <[email protected]>
Cc: Durgadoss R <[email protected]>
Cc: "Pandiyan, Dhinakaran" <[email protected]>
Tested-by: Ville Syrjälä <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Tested-by: [email protected]
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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