OMAP: DSS2: Taal: add locks to taal_bl_update_status
taal_bl_update_status was missing locks to protect taal_data. This caused
a kernel crash randomly, as the code attempted to set the brightness while
the OMAP's DSI block was actually disabled.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>
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