MLK-19252-1 drm/bridge: sec-dsim: move PLL check to DSIM Encoder

MLK-19252-1 drm/bridge: sec-dsim: move PLL check to DSIM Encoder

Defer the PLL output check to the SEC DSIM Encoder's atomic check
from SEC DSIM Bridge's mode_fixup(), since in the attached DSI
device Bridge's mode_fixup(), it may change the data lanes number,
and this change is done after the SEC DSIM Bridge's mode_fixup().
And the DSIM Encoder's atomic check is the ideal place to do this
PLL check, since it happens after all the Bridges' mode_fixup()
done.

Signed-off-by: Fancy Fang <chen.fang@nxp.com>
(cherry picked from commit c9bce66fed982383dde189c428d4c2ee2c2fc623)
(cherry picked from commit ead3666313e552296da7e7b5094579b47dbdc364)
(cherry picked from commit 6a8fa239b31eca24f32b350e3c7e3118684b7323)