drm/i915/dsi: Retrieve max brightness level from VBT

So far, DCS backlight driver hardcode (0xFF) for max brightness level.
MIPI DCS spec allow max 0xFFFF for set_display_brightness (51h) command.
And VBT brightness precision bits can support 8 ~ 16 bits.

We should set correct precision bits in VBT that meet panel's request.
Driver can refer to this setting then configure max brightness level
in DCS backlight driver properly.

v2: modify variable name brightness_precision_bits instead of
    max_brightness_level.
v3: fix checkpatch warning.

Cc: Ville Syrjala <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Vandita Kulkarni <[email protected]>
Cc: Cooper Chiou <[email protected]>
Cc: William Tseng <[email protected]>
Signed-off-by: Lee Shawn C <[email protected]>
Reviewed-by: Jani Nikula <[email protected]>
Signed-off-by: Vandita Kulkarni <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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