msm: mdss: Add missing BL lock around BL-related info
The bl_updated variable requires the BL lock. Otherwise, it can be
corrupted and cause backlight issues.
Change-Id: I55eb4b8d525765ede4f27a404f5c3f1f0b446719
Signed-off-by:
Benet Clark <benetc@codeaurora.org>
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