Revert "drm/i915: Parsing LFP brightness control from VBT"

Revert "drm/i915: Parsing LFP brightness control from VBT"

This reverts commit 371abae844ede392066bfc21202b2e40f4a654d1.

This data seems unreliable and causing many issues and blocking other
teams and feature implementation. Safest way is to revert that for now.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=88081
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=88039
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=87671
Cc: Vandana Kannan <[email protected]>
Cc: Deepak M <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Ben Widawsky <[email protected]>
Cc: Kristian Høgsberg <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
Reviewed-by: Jani Nikula <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>