drm/msm: convert msm_format::unpack_tight to the flag

Instead of having a u8 or bool field unpack_tight, convert it to the
flag, this save space in the tables and allows us to handle all booleans
in the same way.

Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/590428/
Link: https://lore.kernel.org/r/20240420-dpu-format-v2-6-9e93226cbffd@linaro.org